Good teacher. In class he explained everything very clearly and also showed us more effictive ways to do it. Be prepared to work! Lots of programming assignments...(How did you expect to learn to program?)

This is a tough teacher. Lots of people aren't gonna like him because he won't slow down for anyone. But experienced programmers who complain about dumbed down classes, like me, love him. He's fair, people DO get A's in his class. Tad slow answering email

Excellent teacher and an asset to the college. His classes are hard if your not prepared. Focus and ask questions, he is very nice and 100% professional. I recommend for 1A, 1B, 18A, 18B, 18C. Take any of those classes with Dr. Lehr and you'll be happy.

I took his online Java class. The class is easy if you have previous programming experience. You have to put a lot of time into finishing the two projects. But it was fun. I recommend him.

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Unfortunatly I had to drop the class, but this was more my fault than the teachers. Java requires more time than I thought and taking one more class along with work during the Summer session is not feasable for me. I look foward on taking the class again someday though with Prof. Lehr and would recommend him to other people.

The man is a legend, or a legendy in the making. I took C++ objects programming, this class is very, very hard, but if you go at it, you will succeed. I DO recommend Dr. Lehr, he is an excellent instructor, a very polite human being and very helpful. Good luck!!!! Take his classes!

He did not adhere to the policies he set forth in his own syllabus. Was asked about the situation by multiple students, to whom one of them he replied that it didnt matter because it wouldn't have THAT much effect on a studentt's grade.

Had him for CIS 17a,b,c, & 18 a,b. Very fair teacher. As he says, "he'll give anyone enough rope to hang themselves" If you don't do well it is your fault. If you can't solve Towers of Hanoi, find another major. I went on to CSUSB and am years ahead of the other students. If you are a programmer, join ACM.

Dr. Lehr is very good at what he does. The only people to complain about his class are those that are lazy, or just not interested in becoming good programmers. You will learn a lot in his classes, and you will be challenged which is what makes his classes great. Best teacher I've had at RCC.

Extremely Interesting

GREAT TEACHER!!! He is the best! He is hard but he is the best.

This guy is inspirational. I don't know how he could be considered a jerk. I just think most people are too stupid to realize his brilliance!

Great instructor. I didn't know anything about programming and took the course as a pre-requisite for another program. Learned stuff way beyond the book. Insights were amazing and went out of his way to help me with homework and projects.

My only cis class so far. First professor I have had that didn't teach out of a book. Everything he covers can be applied in the real world. Can't decide what my major should be but he gave us enough database material to let me think I might be cutout to be a db administrator. Time will tell. I will take him for as many classes as I can.

I am so glad I had Dr. Lehr before transferring. Everything at UCR is understandable. He also works at a software company on the side and recommends his students for internships. I am going to take him up on his offer.

I had Dr. Lehr years ago. Graduated from CSU San Bernardino thanks to taking his classes at RCC. Finally get to take another class with him after all these years. He was the best! :)

Didn't know what to expect but I was pleasantly surprised. The course is very difficult. A high degree of programming skill is required and having a calculus background in math helped a great deal. This instructor made it understandable and practical. Hard to find a professor that can do both well.

Great class. A little too much for six weeks. Wish I had during a regular sememster. Instructor's bark much worse than his bite! :) Willing to help out a great deal if you have looked at the material.

You can tell he does programming for a living. His insights are great and he points you in the right direction. Hope they have the more advanced classes offered in the Fall

He is the only teacher I have had that had us doing practical problems that you can use outside the classroom. We used open office to calculate how to buy a car, a house, compare leases, save for retirement. Don't know if I will ever use the other things in the course but these will prove useful later on.

This is the only professor I have had that solves problems by writing the code in front of the class. He shows you how to code, what could be a problem, then how to debug it. When he lectures, he will derive problems from the content of the lecture then code it so we get the point.

He is great. This was only my first class with the professor. Looking forward to taking the advanced programming courses with him.

This class has ended up being very important in my part time job and computer science degree. Hashing and the common linked lists are used everywhere I turn. Dr. Lehr made it simple to understand and presented practical techniques for implementation. Just waiting for 18c and 17b to be offered by him hoping budget cuts won't impact offerings.

Great class. Really need to take the intro course before this one. Java very much like C++. The professor answered all my questions. Professor was not only willing to help out with problems but gave me great career guidance. Much better than the counselors.

The class was great. The instructor gave us real world examples and I learned a lot. Very difficult class though. Don't take this class unless you have had all the pre-reqs!

Great class, I would recommend taking CIS 5 first. Instructor assumes you already know the basics of programming. Initially, a quick review but leads right into pointers. If you aren't into programming this is not the class for you. If you are, you won't find a better professor.

Dr. Lehr was a very good professor. He not only saved us money throughout the class, but I have a feeling he will be saving me money throughout my future. He will teach you everything you need to know to purchase things such as cars and homes. I think he looks exactly like Scott Pelley, what do you think?

Have to laugh about a previous students post. The professor spends 20 minutes at the start of a 3.5 hour class to get students to understand the math associated with conversions and IEEE floating point standards. Anyway, great class and the instructor presents much more than book. Plan on taking him for 18a! :)

Just finished my midterm and project!!! :) Professor is easy. Just listen in class, read the book, do the homework. I was not looking forward to taking the class since everyone said it was so hard. All bunk.

I agree with the guy in 17a. Read the book, did the problems and the midterm was a lot of work but easy. The project was even easier but the writeup is a pain. I like the fact that the instructor codes right in front of us and he does this for a living. How often do you get that.

Didn't know if I wanted to be an engineer. The course was recommended by a STEM counselor. It turns out that it is a great intro course. Dr. Lehr's enthusiasm for engineering is catching. I am now a believer.

I had Dr. Lehr a while ago. Just got my acceptance into Cal Poly. All I can say is thank you. Initially, I had a lot of problems. He kept encouraging me, gave me more than I deserved. I will not let him down.

A real Engineer. He has worked on some great projects. We won the Cal Poly Pomona Robotics competition and the Cardboard Boat competition during the Spring. THANKS Dr. Lehr. We have a great introduction of what it is going to be as a future engineer. You are the greatest!

Not exactly easy, but just do the homework. For any student that is going to make programming/software a career, this is the prof to take.

If you are going to program for a career. Take this guy.

Take CIS 5 first. All the other classes like 14a, 12, 17a, 18a depend on this class. I took 14a out of sequence and didn't do well. Went back to take CIS 5 and everything fell into place. Don't skip and it will be easy! Prof Lehr gives internships to students that do really well on the projects.

Great intro class for engineering. The instructor was an actual engineer. If you want to know what engineering is like and what you need to know, he can guide you.

Programming is hard. Kind of like mathematical proofs. However, if you do the homework and pay attention, this turns out to be an easy class. If you fall behind, you won't catch up. I would take this during a normal semester unless you have a lot of time to take during the summer or winter.

Great Professor! He really does know what he is talking about and he really does get you to think like an engineer. If you are interested in engineering as a major, he is the professor to take

Great class. Learned how to save for retirement, purchase a car, buy a house. All practical stuff while learning how to use open office. Even configured a computer based on a cost/benefit analysis. The projects in the class will turn out to be more useful in the future than the class. Dr. Lehr is hard but in the end it was worth it.

Got a job halfway through the course. Learned enough PHP to make the difference. Another student had the same experience. The instructor made all the difference.

Awesome Professor! He brings experience to the classroom and really teaches you how to write efficient code. I have taken him for four different classes now and plan to take more.

I got tired of hearing about NASA, but he really has some amazing field work. I learned a lot from him, but I hated not knowing where I stood in the class. He didn't grade anything submitted until the end, which scared me. He will answer questions, but I found it easier to search on forums. I will take him again, mainly because of distance.

Good teacher with lots of experience. Only complaints would be that sometimes he thinks he knows where your question is going and interrupts to answer and you have to ask again, which is kind of funny sometimes. No big deal. Big complaint would be not knowing anything about your grade the whole time. Three days before the final and I have no idea.

This is the only instructor I have ever had, that programs right in front of you during class. Ask any question and he will develop a solution step by step if you are having trouble. You will learn how to think like a programmer.

We compared Car leases to owning, owning or renting a home, even how to buy a computer given a list of requirements. Databases, spreadsheets and presentations were all included. Most practical class I have ever taken. Dr. Lehr was great!

Hard class but learned a lot. Makes you think. He says things not the same as other Profs.

If you want to be an engineer, this is the class to take. The instructor has worked in a defense firm and at NASA. Easy class if you like math and science.

If you want to be a programmer, this is the class and the instructor. Everyone says it is difficult. Not if you study and do the homework

I would take CSC 5 first, maybe even CSC 17a. You will get a lot more out of the course. Dr. Lehr offers internships at OmniPlatform if you do well. Can't beat the course if you are going to become a web programmer.

This course and the instructor were not easy. Now that I am at Cal State San Bernardino, I am glad I took the course. Everything here is easy compared to that class.

Great Class. Summer session was a little fast but thats what happens when 16 weeks is compressed to 6. Can't wait for the advanced class in the fall.

Took his CIS-1A class for the winter session. No textbook needed, no quizzes or tests, just a final towards the end, lab hrs are a must. As long as you do your HW the very best you can, and turn in something. Pay attention to the lectures, I'm horrible when it comes to math yet I passed with a B. He speaks fast but clear. Dont be late! Cool guy!

Discrete Structures is more a math class for programmers. Kinda like a geometry class with proofs but all in logic. He does a great job of relating the math to how it will be used in apps. Really makes you think.

I have had Dr. Lehr for the core CS courses. I wish they would let him teach the advanced courses more often. I prefer to take them in Riverside, vs going to Norco. He is a great professor and decided to go for a computer science degree after taking his intro class.

I took four courses with him and did well in them. His assignments may seem downright intimidating, but if you do the work and put effort into it (even if it's not great) he'll give you a good grade. He's very easy to talk to and he'll go out of his way to help you if you ask for it. Overall an excellent professor and would highly recommend.

Great intro class. Really let's you know where you are headed. Well worth all the work if this is your major. The professor tries to connect real life problems with code.

He is very passionate about technology. Some of his assignments may not be 100% clear, but he's incredibly flexible on grading. If it works and you can explain how it works, you've got it. He's not there to punish you for anything or make it tough you, he wants you to not only learn, but know what you learn. Take him if CS is your passion.

this guy is an expert and awesome at computer programming. He's probably the best professor at RCC.

The Prof was an Engineer. Great intro and practical class. Perfect set of classes to 5A/5B and Ene 4 to then apply for Cal Poly's program.

Professor Lehr gave actual working examples of code used in the field. Codes right in front of class and answers questions by coding them directly. Plan to take him for Data Structures as well.

The instructor tries to make the class seem simple. But it is a difficult class if you have never programmed before. He was great at explaining all the concepts. Put in the time and you will pass!

Great class. Professor has practical experience and relates to problems reviewed in class. Coding is all I do! Join the ACM and code in the competition!

Very practical class. Professor Lehr was an engineer and knows what is important. Learned alot!

Take him, you will learn it!

Amazing professor. Lets just put it this way, I went in as a economics major wanting to dabble in computer science. After taking his class I full on changed my major to C.S. His class was amazing, although VERY tough. Only for serious students. I went in a complete noon and walked out feeling like a "programmer", amazing how much i learned in 6week

Great class. The instructor makes the difference. On my way to Google :)

Once you understand pointer notation and class-object concepts, everything else is easy. Lehr was a great instructor with practical experience.

Got into Cal Poly!!! Thanks Dr. Lehr

Accepted to Cal Baptist and UCI. Never thought I would be going to a University. Lehr is the best.

Be prepared, this is a math class! Lots of programming examples but definitely logic, math, proof oriented. Lehr explains why you need it. Take it with him and you will get through it!

Not a particularly difficult class unless you have never programmed before, do keep in mind it is a complete pain to install Nextbeans IDE onto Windows systems This weeds out a lot of people, don't let it weed you out! I got an A, but there is A LOT OF WORK. Make sure your programs compile, and you follow instructions precisely.

The project was a lot of work with all the documentation. However this professor gives take home tests where answers to the programs are known beforehand. Just code and you got it! Lehr makes you think, no tricks.

I took this class in high school. Way different in college. Learned so much more in Lehr's class. Don't use doubles, or global variables and you will do fine!

Lehr would always say, it is not what you learn in class that matters but what you take away and how you use it. If you want a job, you need more than just classes. Do projects, develop web apps, intern, network, go the extra mile.

Very hard subject but the core of Computer Science. Lots of math involved. The instructor graded on a mix of theory and coding of concepts. He likes to use Bitcoin as an example of many Data Structures. You will learn a lot.

This course has group projects. Half the group was gone by the end. Left the rest of us completing the whole project. Great class, just don't like group projects.

Great class, prof was a real engineer. Worked at defense firm and NASA. Take the class, you will like the robot projects. Wish he would teach statics!

Very expensive textbook but you will need it. Really a math/logic class. Reminds me of geometry with all the proofs.

Learned a lot from Dr. Lehr. Will take as many CS classes as I can get from him. He recommended a cyber security program at CSUSB which might be a good fit for me. I like that he answers questions and codes in class.

Math is my subject and this is definitely a math class. Discrete structures are very different from the functional analysis. Perfect instructor for the course. Book is way expensive!!

A must class to take. But, I took in the Winter (6 week) session. You can do it if you are not taking any other classes, don't work and have the time. Or maybe have programmed before. The instructor is the best.

Great prof, learned a lot. Codes homework problems in front of you so you know how to improve your code. Gives the answers prior to take home tests, so you know your grade before you turn in. Provides checkoff list for projects so you know what is important to include for a better grade. Reviews power points and corrects the books errors.

Dr. Lehr gives great advice. Make sure you completely review your intro class prior to this course. You will get an A if you create and fully document a large gaming project with pointers, classes and templates. A lot of work!

Well, I am not a fan of group projects but in some ways it is helpful. Liked the class and the instructor. Perfect class to take at night.

Prof. Lehr relates class content with real world applications. He has a lot of experience as an engineer and has great stories to tell. Enjoyed the class and the instructor!

Discrete structures is a logic/math class related to digital circuits. Plenty of proofs and derivations. There are about 10 quizzes that you must study for, do not walk in cold or you won't pass. The professor relates engineering problems as well as Bitcoin to topics covered. One of the best classes to take with the best instructor on campus!

Final was great. He wrote the specification for the class, driver code and had sample I/O. We just had to write the .cpp files. Homework was easy. Projects were just a game with OOP concepts. Documentation for the project was a pain, but overall, enjoyed the class.

We wrote 3 applications. A game we got to choose for a group project, then 2 individual projects that were assigned. These were a survey engine and a shopping cart. You have to be good at objects or you won't pass the class.

It took me awhile, but I finally got it. I am an engineering major and this course is required. Luckily, the Professor is an Engineer. He had some great stories to tell about his work and showed where concepts were useful out in the real world. Hope to take him for my Engineering courses.

Bitcoin! Expect to hear a lot. The code is where you will create your repositories, up at Github. Great class, he codes right in class and solves a lot of your homework for you.

Lehr is a great man. Grades tough but is fair based on what he teaches, if you fall behind you will struggle but he is willing to help you. 9.9/10 will be taking him for future classes.

He's a great teacher who loves to teach his students life lessons as well as insider tips, but his assignments are very tough and the major assignments and tests he assigns are extremely heavy on your grade. If you wish to pass this class then this might not be the teacher for you but if you want to meet a great teacher then he is your man.

Dr. Lehr is a great professor. Although he may seem rough around the edges, he is easy to talk to, and will respond to your emails, answer questions, etc. His lectures are clear, and his examples are also clear. That being said, you will have to work for a good grade in his class. He expects a lot. But if you put in the time, you will succeed.

Thank you Dr. Lehr for all your advice. Cal Poly accepted me!

Lehr shows you how, why, and where data structures are used. His insights are thought provoking and his proofs are beautifully concise. If you can simulate, count operations, and do timing analysis you will pass if you can't do all the math.

Mr. Lehr was the most knowledgeable programming instructor I have had. He coded directly in front of the class in response to questions asked. I think it is fairly rare to see a thought process transferred directly to code. It helped conceptualize C++ classes/objects for me. Still difficult but enjoyed the class.

On my way to UCLA! Thanks again for all your help and guidance.

Great class. Discrete math is very different from calculus. Logic, counting, circuits, probabilities, etc.... I have had Lehr before and this class is much less coding an more math intensive. Know definitions, exercises from the book and this class will be easy.

Dr. Lehr really shines in teaching this course and puts his professional C++ expertise/mathematical background to good use delivering high quality instruction every week. One caveat is that you won't receive any feedback about your grade until the class is over. Not a problem if your priority is gaining a better understanding of data strux/algos.

Made it into Cal Poly!!!! Thanks Dr. Lehr

Discrete structures is more of a math class than a programming class. Lehr connected the dots from theory to show how it is used in the real world. Beware, he loves bitcoin!!!

This class was a lot of work. Probably more than most. However, I eventually got it. Dr. Lehr codes in front of you which helps out a lot. You can see how to develop the problem. There is a thought process involved which really made coding more understandable.

Thanks Professor Lehr. Got into UCI.

Thank you Dr. Lehr for all the help. Virtual on-line office hours and the discussion board were the only way I made it through the class.

This class is a must for all computer science majors. The professor did an excellent job of deriving all the concepts with insights on when, how and why to use all the data structures.

It has been a few years since taking this class. Dr. Lehr got me interested in engineering. I just graduated from Cal Poly in Mechanical and just got hired. Many thanks for your pointing me in this direction!

This turned out to be the most useful class I took. We created a Web App/Game as a group. Instructor gave great pointers and advice.

If you take this course during the Winter or Summer intersession, be prepared to do nothing else. Prof. Lehr has real world experience and relates that in class. I highly enjoyed the way he teaches, very entertaining.

Lehr is great at data structures. You have to listen and search for references. But his class examples show the in's and out's. Wait to take this class until you know classes and templates.

The quizzes are not pop quizzes, since you know when and on what topic. Just read and memorize the definitions and do the homework. This class is really like a math/logic class with programming concepts thrown in the mix. Dr. Lehr is the perfect professor to teach since he relates his AI work and Bitcoin to everything.

Taking this class in the Winter session was difficult since it was 1/3 the time compared to a normal semester. We used a tool which graded our homework and tests providing immediate feedback. You learn a lot and will take Dr. Lehr for the more advanced courses.

Dr. Lehr was always available to help with problems. He gave lots of helpful hints for my project. CS is not my major but I learned a lot.

The course says it is Discrete Structures but a more descriptive title would be Discrete Math. It is transferable to UC but I had to get the syllabus for them to accept it since assist has the wrong course listed. Dr. Lehr was great and always related content to real world applications.

Loved the instructor. He has a real different sense of humor. Had to take the course for transfer in to the sciences. STEM!

I am not a big fan of group projects. However, if you get the right team together you can make a good application. The individual projects were challenging as well. Dr. Lehr directed what concepts to use and the rest was up to us.

Datastructures is how to write code! Dr. Lehr showed us many different ways to get the efficiencies. The math was a little over my head but his examples got the point across. Great class!

I was having trouble in the on-line class. I wouldn't recommend taking the online vs. the face to face if you can avoid it, just because programming is hard enough. However, Dr. Lehr spent several 2 hour sessions in zoom which was way beyond his 1/2 hour scheduled to help me and walk me through solutions and techniques. This made the difference!

His stories from General Dynamics and NASA are worth the work he makes you do. I learned alot. He will keep you awake.

Had him for both 7 and 17C. This guy is way too vague on any given assignment. Has too high of expectations. Does he really expect us to read his mind and just know what hes talking about? Instead of learning how to code its more like learning how to chegg

Dr. Lehr tells you to do the homework questions, know the examples from the book forwards and backwards, memorize the definitions and you got most of the grade. The labs are just fun problems to keep your programming skills up. He even chooses 70% of the homework questions that have answers at the back of the book. Def, study for the quizzes!

Great class. Lot's of work but the Professor was online answering questions in virtual hours or replying in the discussion board. I would recommend taking in full semester in face to face format if this is your major!

Needed to get through this class for Data Structures in the Fall. Dr. Lehr gave great advice for the project and helped with class/template concepts. Look at the code he posts for clues to the tests.

Worked on finalizing the project for the class. I hit a bug which I couldn't figure out. Almost 600 lines and Dr. Lehr found it immediately then made suggestions on how to get the A. Great guy!!!

Take home tests, develop your own projects! Still not a cake walk but what more could you ask for? I felt like if I put in the time I would get it. The instructor gave me several hints about the final as well. See you in the Fall for datastructures Prof Lehr.

Looking forward to 7 and 17c in the fall. Doing really well on the Projects makes up for the tests. Get a head start on the projects, do not wait.

Easy class for math majors. Lots of logic, proofs, and statistics. Study for the quizzes by doing well on the homework. Know the definitions. Quizzes are big part of grade. Lehr showed how it all applies to Computer Science.

The class was composed of 3 projects. 1 Game Group project and 2 personal projects like a shopping cart and survey engine. You have to learn databases, UI, web interfaces, etc.... The professor showed key concepts then expected us to implement in our projects. Kind of like a job where your judged on a product not a test.

Once you understand classes/objects/templates it is all worth it! You better have CSC 5 down cold!

Not an easy class. But take home tests and I got to choose my favorite game to code for both projects. You got to take notes, read the book and don't wait to do the homework, projects or tests to the last minute.

Nothing got graded until two weeks after the class was over and then final grades were submitted three weeks after the final class. If you do all of the work, attend every class, and do the extra credit you should be fine. Even though it was stressful not knowing where I stood Lehr knows what hes talking about. And encourages you to ask for help.

I learned alot from this class. Very time-consuming taken during the 6 week intersession. Feels like I should have waited for a regular semester but I needed to fit into my schedule. Dr. Lehr relates his coding experience when he was an engineer. He has coded for real. Not just an academic. Take him if you get the chance.

Prof Lehr made it relevant but lot's of math and algebra. You should take this class even if it is not on the ADT. It is transferable. I would recommend taking 7 before 17c. I did it in the reverse order because there are no pre-reqs. Some students tried to take it without 17a. Good luck with that! The order of things 5->17a->11->7->17c->17b

Know your math notation and definitions. Each week is a new chapter with homework, labs and quizzes. He gives you the answers to the quiz/tests before you walk out the door. Everything is paper except for the labs and projects which are Netbeans programs. Given you have had algebra/geometry and do the homework this should be an easy B.

Lots of homework. Mr. Lehr developed his own App called Code-E which was kind of like a puzzle to learn how to code. That was great at building my programming skills. You can ask for help on homework and confer with other students. The tests are all take home. The projects you get to choose the game you want to code. Great class!

Dr. Lehr is an amazing computer science teacher. His work is very challenging and gets you to actually think. His projects don't have ridiculous requirements that other professors have. He teaches you what you need to know above and beyond.

I think Professor Lehr is one of the best professors I have taken at this college because he is understanding during COVID giving some extensions if people request it enough, while also having labs and office hours almost every day if you ever have any questions.

You will have to learn everything on your own which will prove to be rewarding later on. You will also pick up most of the material from his projects so don't be too worried if you find his lectures confusing. You find that later in University most professors will teach just like him but at least now you'll be a veteran at finding the information.

Took this during winter semster of 2021. Probably one of the more difficult courses I have ever taken. You need to spend lots of time outside of class but he always answers questions when asked and provides lots of tips for midterm, finals, homworks, etc.

Dr. Lehr is one of the few professors that strike the perfect balance of being a hard-ass and genuinely caring about their students. He's serious about his students becoming real computer scientists, and extremely passionate about comp sci, too. That enthusiasm rubs off on you, and you become inspired and excited to go to class each day to learn.

Professor Lehr is all about practicing coding. Install Netbeans and start solving problems. It reminds me of solving word problems then having the added task of writing the code. Like an extra step in a science or math class. He codes the solutions in front of the class so you can see how it is done. The lab is a good place for help.

The only thing I didn't enjoy about the class, was the group project. You have to do an 2 individual and the group project. Half the group dropped so be prepared to do most of the project yourself. Only take the course if you have had 17a recently. There is no pre-req since you should be able to figure out it is an advanced course.

Dr. Lehr is a no-nonsense type of professor but he cares a lot about his students, he's hilarious with his lectures sometimes, telling funny anecdotes. He explains things in a way that even if you aren't familiar with programming, you'll understand the concept. Responds fast to emails. One of my favorite professors so far.

He re-reviews concepts from CSC-5 in the first half of the semester. If you have never taken him before make sure to have a good understanding of pointers and dynamic memory. The Textbook we use is From Control Structures to Objects by Gaddis. The class is basically 10 homework assignments, 2 projects, a midterm, and a final.

The class might seem postdoc level but trust me, it is doable. As long as you do your work and ask for help when you need it in office hours, you will pass. Expect to put in a few hours every week. He is understanding and gives many markExtensions. Also, the markGrade algorithm is lenient. I learned a lot from the class. - The Malicious Marauder

Though he seems a bit rough when you first take him, he really does care a lot about the class and is very open to questions. He breaks down concepts very easily and some of his instructions are vague, but he's always willing to clarify. Definite take.

He's a great professor I'd recommend to anyone and everyone. Not only is his sense of humor so enjoyable, he truly cares about helping students out. He'll make you work for it, but the process is what he aims for. I wouldn't take anyone else!

Absolute baller

Math class. I recommend you take this class after CSC-17A, not CSC-5 because of the C++ labs. Homework is about 15 hours a week. Have knowledge of College Algebra level math is a must. Midterm is divided as 10 in class quizzes. CSC-17C is basically CSC-7 part 2 so do the homework! Only like 33% survive till Finals week, do the homework!

Very understanding. I submitted a couple of assignments that didn't have all the content and Dr. Lehr gave me a chance to make up and resubmit. He is very understanding about mistakes.

Prof. Lehr saved my transfer. I needed a B but was borderline and he gave me a chance to earn extra credit to bump me up.

Second time taking Dr. Lehr. 17A is a hard class, even more so over summer. He gave out a couple extensions, if you need extra time, just ask! I spent probably 45 hours a week on average for this class, due to the amount of homework and juggling projects. Dr. Lehr always answered all questions in class, so if you don't understand something, ask.

I didn't think discrete math was going to be more challenging then calculus. If you liked statistics then this would be comparable. Dr. Lehr made it practical by using examples from when he was an engineer. If you goal is machine learning/AI, then take with Lehr.

I didn't have Lehr for CIS 5 nor did I take 17 right away after 5. This required lots of reviewing old concepts to come back up to speed. Dr. Lehr helped suggest what review and practice problems would be helpful. Nice guy. I plan on taking 17c with him in the Spring.

He's a cool teacher overall. I had him for CSC17a as well and preferred him for that class. The homework for this class was a bit much. The labs and projects weren't too hard. He's really cool about giving extensions to stuff. It's hard for me to pay attention generally but he wasn't boring. When he talks about other topics they relate to class.

+Very experienced, knows his stuff +Helps you avoid "Old fart programming" +Very helpful if you ask for it -Occasionally veers into life/political tangents -Lots of HW -Hates the textbook, which can be a pain when reading it Whatever your level of coding, he's the best professor you could want. Though probably wouldn't take him for Summer/Winter

Prof. Lehr is the only instructor I have had so far that codes in front of you. He created an online App to grade all of our assignments. You can get immediate feedback and see your grade real time in code-e. Run and submit as many times as you want until the due date. He also gives hints as to common problems when trying to improve your score.

This class was a lot of work until I realized 80%to 90% of the homework answers are in the back of the book. He creates the quizzes from the examples in each section or the homework problems. Just study the Blue boxes in the book. All the labs are games or concepts from Bitcoin. He really is into Bitcoin!

This is the first programming course I have had. It is Python for STEM majors. Very enjoyable class. The instructor uses the same problems from his C++ course meant for python. If you are having a problem with a question, just go to his office hours and he will basically walk you though the solution for homework as long as you have tried it.

My background is in Biology. This is the first course in programming with Professor Lehr. If you have trouble with any of he homework just go see him in office hours. Also, he doesn't mind extending an assignment due date if you ask!

Quintessential baller! I love to code and this is the guy you want to learn it from.

Great Professor, very understanding. Gives lots of homework, quizzes every week, final at the end is difficult but he curves depending on the average class grade. A lot of new material to learn, bi-monthly projects, bi-weekly programming labs, and one must stay on top of the material covered during lecture/HW to prepare for the weekly quizzes.

I am headed to Cal Poly in the Fall. I have taken a lot of classes with Professor Lehr. He is the best Computer Science instructor I have had. If you want to learn how to code then take him.

I took Dr. Lehr in the Fall. I am not a computer science major but after a lot of hard work during the course I am deciding to change majors. There is something about coding that appeals to me. Dr. Lehr talked about programming robots and that is where my interests might lead.

Spoiler Alert: Make sure you review your Algebra, Proofs, and Coding before taking this class. The example problems/homework from the book are where Mr. Lehr pulls the Quiz/Final questions from. If you can take this after 17a might be better than after 5. Take notes for quizzes. Seems to teach the online same as face to face.

Great class but would not recommend during 6 week intersession unless you have a lot of time. I liked Code-E which was an online app that the professor wrote to grade the homework and tests real time. He extends assignments when asked and the 2 projects are really one project just a version with and without arrays and functions.

This is a 4 unit class and it feels like it. 54 hours lecture and it doesn't matter if taken online or face to face, the lectures are recorded. And of course another 54 hours of lab plus all the outside prep. This is the way to go if you want to learn it backwards and forward. Dr. Lehr is a great Prof and he will carry you over the finish line.

Learned a lot in this class. Professor Lehr makes you think about how to code vs. just solving a problem. I was not able to take him in CSC 5 which would have made it much easier. Looking forward to taking the rest of the CS courses with him.

If you are taking this class in the Winter, I would not recommend working or loading up with other classes. I took this with Prof. Lehr and he was great but required a lot of homework and projects. Learned a lot and would recommend for computer science students!

As a reservist I was mobilized during the semester and Dr. Lehr made it a pleasant experience. He gave me every opportunity to make up assignments, exams and projects while viewing the zoom lectures remotely. Very understanding about the situation and I wouldn't hesitate to take him for as many classes he teaches. Thumbs up!

The instructor was available 4 hours a week online for zoom lectures which are recorded and you can watch later. I made a couple of 1 on1 appointments for difficult topics, but the lab most of the time was just as helpful. It took a lot of time for homework, projects or tests but Dr. Lehr had no problem extending the time if you needed it.

Dr. Lehr was awesome. He records the lecture so online students get the same experience. Your grade is 100% practical work, no quizzes/filler. Pay attention to lectures - gives hints in lecture on how to solve the problems! Online students can get extra credit for logging hours on the lab tacker. Don't procrastinate - work piles up fast!

In the beginning I though he was lazy. This might still be true but now that I am working I cherish this man as a professor. With his lack of guidance unless you approach him, I was left to figure out homework and projects on my on. Looking up solutions online like Stack Overflow or reading documentations is what I do at work on the daily.

Hard part: Tough Grading Only 20% grade come from homework (lot). 80% from projects and exams. 2 projects and 2 exams, each take 20% weight of grade. Attendance takes grade you got. Good part: Accept late work (not for exams and work on his website) Record lectures, can watch anytime before class end. Email unobstructed, ask any time.

This class is definitely more a math class than a programming class. Expect a quiz every week. However, he creates his own notes and basically pulls the quizzes from the notes, homework, etc..... The unique thing with this class is that it is online, but posts 2x a week a recorded lecture. Advice is to watch the lecture it really helps!

Thought provoking! Dr. Lehr shows how any negative numbers can be represented as +. Then *, / are just shifted +. Then how to add 2 numbers in any base. Then to code any 2 numbers of any base of any length by simply changing 2 lines code with / and %. All using a single logic statement converted to a single type NAND or NOR gate? Amazing!!!

His class was very enjoyable. I suspect the people leaving bad reviews weren't listening when he said it's important to read the textbook and when he told us where we can find our grades. The homework assignments are fun and the exams are take-home projects that we have several days to finish. He's very flexible with due dates. Awesome professor

I have taken Dr. Lehr in several courses. His M.O. is basically the same. The homeworks are prep for the exams and projects. He will give you mostly a 100% if you do them and you can even ask for extensions. The exams are take home and he gives you a week. If you don't do well on the exams, then do well on projects. Easy A but lots of work!

Thank you Dr. Lehr for your advice. The counselors are not aware of the easiest path to take through the courses and you helped out quite a bit. I started out in programming but ended up in cyber security. On my way to CSUSB for the Fall!

Thank you for writing my recommendation! Cal Poly here I come for Fall 24. Dr. Lehr was there in office hours for clarification of problems or mentoring on where to go and what to do when I get there.

This is the only professor I have had that codes in front of the class. He takes a concept and walks you through the development of the code. Then he makes step by step improvements with each iteration of the code. I would recommend as a must for beginners. He is big on students asking questions. If you don't ask you won't slow him down.

Positives - Will extend assignments, always available, just ask questions. Very helpful. Negatives - Grades late. Definitely watch lectures for what he considers important.

This professor is really into Bitcoin data structures. Anything from linked lists, hashing, bloom filters, merkle trees, etc.... in his discrete and data structures classes. He gave simplified labs in CIS 7 which I didn't know why at the time, but it makes sense now in CIS 17c. He is great about extending assignments!

The professor warned us about group projects. They are definitely not fun. Work load was very uneven. Learned a lot in the class about transforming local apps into web apps. Didn't seem like it was worth it while doing these projects but in the end it worked. Great class and Lehr had no problems giving more time if you asked.

There is definitely a lot of work in this class. Dr. Lehr expects a lot from the students. Might be best to take this one after 17a. However, he is very fair. He does grade on a curve which won't apply till the end, but expect a nice boost into the next Grade indicated in Canvas.

This class has group projects which I can't say I like. However, I would recommend do well on your individual projects. Some may slack off on the personal projects and rely for a grade on the group project. Prof. Lehr I believe weights the individual projects the most and grades on a curve.

Pay attention to the lectures. Dr. Lehr is great with deriving concepts and code from first principles. He is very big on your ability to determine the big 0 of the algorithms. Don't wait to get started on his homework or tests. You will need all the time. Learn how to curve fit functions! Enjoyed the class and his explanations.

Interesting class. Most students don't like group projects, however, I really came to enjoy it. We did a Battleship project and learned a lot. Dr. Lehr pretty much introduced concepts that we could use or not. He gave us a lot of freedom to decide on how to implement and was there to answer any questions.

Certainly not a bad professor but isn't the best, recommended for his python class!

The professor was very straight forward about taking this class in a short term summer session. Told us upfront that it was going to be a lot of work. Dr. Lehr had great insight into were students were going to have problems and helped everyone getting over the hump. I look forward to taking him in 17a during the Fall. Highly recommend.

Make sure you follow the lectures! You will be tested specifically on what he covers in class. Know how to curve fit and analyze algorithms. This was a great class with practical knowledge. I would recommend learning how to curve fit functions before taking the class. Also, taking CIS 7 before 17c really helps.

Great Instructor. The class was very difficult for a beginner like me have to take it in such a short time frame. I would suggest taking this during a regular semester like the Fall and Spring, not the Winter or Summer. The instructor was available to answer all my questions.

Did the ADT to transfer for CSC. Dr. Lehr was a great instructor and gave the best advice! Thank you and the rec for CBU. Just started Tuesday and the fist week gave me great confidence with the courses taken at RCC.

It took awhile but it all started to make sense with this class. Professor Lehr explains things from a practical stand point and relates to projects he has done in industry. His stories about his work experience are a pleasant diversion when sitting in class for hours at a time. I plan on taking him for the rest of my classes before transferring

Dr. Lehr has some unique coding techniques. I saw some reviews but one thing is true, he is always showing code related to projects, or homework, or related work in engineering. Have learned a lot and will keep taking him. Watch his zoom lectures and everything falls into place.

After taking this class I changed my major from Biology to CS. Dr. Lehr only grades on your ability to write code. He showed us real examples from when he worked on missiles and rockets at NASA. I will be taking all my CS classes from him till I transfer. Great class and even better instructor.

Really liked the insights the Professor gave during lectures. Having said that, if you are taking online, you will need to watch the Zoom lectures to pass the quizzes/tests as well as hints he gives on the labs. Also, the quizzes are proctored.

Prof. Lehr is clearly knowledgeable and presents the material very well in lectures. This online format, requires Zoom meetings. While feedback and grading were provided at the end of the semester, the focus is absorbing the material presented in the lectures. If you're comfortable with a more independent learning style, this could be a good fit.

Dr. Lehr's assignments provide difficult by valuable hands-on experiences. The final exam, though not curved, will constitute a substantial portion of the grade, so make sure you review the zoom video lectures for the solution of all the quizzes. Take notes during zoom lectures since not everything is written in the assignments!

Here is the key to Dr. Lehr's course. Watch the zoom lectures or attend the class real time. What he says in lecture will be on the tests and homeworks. He directly correlates his lectures with the text. In general, he takes topics from the text, applies them to a problems he has implemented in industry and shows you how they work.

I liked how Dr. Lehr will code in the class. He will take a concept, start with an initial version, then progress till it covers the complex topic in the text. Some concepts he will iterate through maybe 10 versions before complete. He approaches coding from first principles. The zoom videos are a little long but put on x2 when appropriate.

The problems in Web Assign are difficult but you have lots of tries to get them right. The professor treats the online and face to face classes the same. Watch the zoom recordings since he lectures on what he considers important from the book and he reviews all proctored quizzes right after we take them.

We used the Gaddis Book for 17a. Liked the book, instructor and the lab. Definitely join the computer club and sign-up for the Programming Competition. Pretty much if you watch the zoom lecture you will understand the course, if not you will miss important information and be pissed off for skipping it. The professor is available anytime!

Watch zoom lectures and take NOTES! Make sure you review quizzes the following lecture since those will be on the Final! Better to take this class after 17a!!!, do not listen to councilors on order of classes. I got a B but could have got an A if I followed Lehr's advice, my own fault. Take a light load that semester since this is a Math course.

I took the class online during the Winter 25. The workload was heavy, and I wouldn't suggest taking in a 6 week time-frame. It would be better taking it face to face during a semester since you have to watch the zoom videos which is like being there anyway. But, I liked Prof Lehr's quirky humor and no doubt learned alot and feel prepared for 17a.

Dr. Lehr had a couple of his former students that are working out in industry come talk to us about their path from student to graduating to getting a job. During lectures he equates what he did in industry to the code he writes in class. In HS none of my teaches coded in front of us. The course was difficult but I will take him for 17a.

Professor Lehr's recorded lectures and real-world examples were highly effective in teaching coding. His industry experience and live coding demonstrations were particularly valuable for bridging the gap between theory and practice. I plan on taking him for 17a and 7

Although he does take a while to grade, what your grade actually is should not be a surprise. All assignment expectations are as clear as possible and you know when submitting something where you meet al criteria or not. I recommend each chapter before attending lecture as it will make it easier to follow along. Will be taking him again for 17A!

Took him this spring and he is a good professor. Really smart and he has been in the industry before so he has a lot of experience.Learned a lot from him. The only problem is that he grades like 95% of your assignments, exams, and projects the when the semester ends. Didnt grade project1 or final exam, but graded project 2 and midterm.

This was basically a math course with a lot of coding for the lab assignments. I liked the way professor Lehr related concepts presented in the book to applications out in the real world. I am glad I took 17a prior to this class. The counselors will tell you to take after 5 but wait. The quizzes are scheduled and proctored if taking online.

You gotta review the lectures. Many key points not provided in text. He will give a lot of hints on exams. I liked the way Prof Lehr compared elements of his code to projects he worked on in industry. Make sure you follow his pathway progression 5-17a-11-7.

Dr. Lehr teaches a systems-oriented version of DSA. You will be building structures (Linked Lists, Trees, Hashing) from scratch. You'll actually understand the 'why' behind the logic. Warning: You are largely on your own for implementation in projects. Take him, but clear your schedule—it's a major time commitment.

You will have a quiz about every week. He covers the topics before the quiz and goes over the quiz the next lecture. All these types of problems are on the final so live and learn. It looks like he uses the quizzes to teach and doesn't grade. That will improve you grade by at least a letter!

Great course. The key is to listen to the zoom lectures. The professor treats the online and the face to face course exactly the same. He records the lecture for both. If you don't watch the lectures, then you will be lost.

Here is the key to the class. I didn't do great on the tests but I put in a lot of work on the projects. Showed many versions and included all the concepts from the checkoff sheet. You can get an A if you show how much work you did on the projects. Also, watch the lectures either real time or recorded. He always records a new set each semester