4.8

Karl Schaefer

Mathematics - Washington University in St. Louis

4.8
Quality
2.9
Difficulty
97%
Would Retake
162
Reviews
4.8
Quality
2.9
Difficulty
4.8
Helpful
4.8
Clarity

97%

Would Retake

162

Reviews

Rating Distribution
Official

5

147

4

7

3

4

2

3

1

1

What Students Say

Prof Schaefer is seriously the greatest

MATH233 - 5.0 rating

I took him remotely, so take this as you will

MATH132 - 5.0 rating
Class Info

Online Classes

100%

Attendance Mandatory

6%

Textbook Required

0%

Grade Predictor

Your expected effort level

LowHigh

Predicted Grade

A+

95% confidence
Based on 129 grades
Most common grades:
A (69)
A+ (31)
A- (14)
Grade Distribution
A(100)B(3)C(0)D(0)F(0)A-/B+(26)
Based on 145 reported grades
A: 69
A+: 31
A-: 14
Not sure yet: 14
Common Tags
Amazing lectures (80)
Caring (70)
Accessible outside class (51)
Respected (42)
Clear grading criteria (28)
Hilarious (26)
Inspirational (18)
Test heavy (15)
Rating Trend

Improving

+0.23 avg change
May
Jun
Jul
Oct
Nov
Dec
Last 6 months
Ratings by Course

MATH100

5.0

(5)

MATH4351

5.0

(5)

MATH310W

5.0

(1)

MATH310

5.0

(1)

MATH233

4.9

(46)
+2 more courses
Difficulty by Course

MATH310W

4.0

MATH310

4.0

MATH309

3.0

MATH132

3.0

MATH4351

2.8

Reviews (162)
1.0
5.0
MATH132
Oct 30, 2020
Wouldn't take again

Prof Shaefer is a nice guy but not a great teacher. He acts like we are supposed to know the material before we've even learned it. The pace of the course is way too fast and he does not prepare you for the homework, assignments, and quizzes.

Lots of homework
Test heavy
3.0
5.0
MATH132
Oct 30, 2020
Would take again

I feel like it's tough to give an accurate rating for prof shaefer. On the one hand, he's super nice and gives very in-depth help if you're looking for it. On the other hand, his lectures aren't great (I imagine that pre-covid lectures would have been better). and his quizzes are really hard.

5.0
4.0
MATH132
Nov 6, 2020
Would take again

Professor Schaefer is an amazing prof! I don't always enjoy math, but his lectures were consistently interesting and informative. There was usually some stuff that I didn't get on the first pass - I think he could've gone a little slower - but I was always able to get help in office hours. Quizzes and the Midterm were hard but fair. Study lots!

Accessible outside class
Amazing lectures
Caring
4.0
5.0
MATH132
Grade: A
Jan 7, 2021
Would take again

Professor Shaefer is a really great guy. Although this class was definitely the hardest class I took this semester, I think he did a good job teaching considering the pandemic. The best part about Professor Shaefer is the amount of genuine care he has for his students. He is incredibly accessible by email and writes really kind & lengthy responses

3.0
4.0
MATH132
Grade: A
Jan 10, 2021
Would take again

This is a hard teacher. I personally liked him. Many people did not. He taught the concepts okay but I think he cared about the students. The quizzes are HARD. However, read the syllabus and you will see that the class grading scale gives leniency. You really need to do textbook problems, pay very good attention in class, and work super hard

2.0
4.0
MATH132
Grade: A
Jan 12, 2021
Wouldn't take again

It's a lot of work. I don't know if COVID played a major role in my opinion on this class but I think Prof Schaefer could've done a better job of finishing examples in lectures, providing HW that at least resembled what we were being quizzed on, providing any practice quizzes, & giving reasonable length quizzes. Some of the quizzes averaged 55%.

Lecture heavy
5.0
4.0
MATH132
Grade: A-
Jan 16, 2021
Would take again

I took him remotely, so take this as you will. I am not a big math person, but his lectures were interesting and thorough to make me understand concepts I had not previously. The hw is not too bad, but the quizzes/tests will be difficult, so make sure you attend your discussion sections, as often the quizzes will be based more on those than the hw.

Test heavy
Amazing lectures
Lecture heavy
5.0
3.0
MATH309
Grade: A
Mar 8, 2021
Would take again

Really nice guy. Good lectures, bad handwriting

Graded by few things
Lecture heavy
Caring
5.0
2.0
MATH132
Grade: A
Apr 23, 2021
Would take again

I also had him for 233. He is a completely reasonable and intelligent professor, and I thought he did a perfect job explaining concepts and performing examples via online lectures. His explanations of calculus concepts were the clearest I've seen any professor give. Quizzes are not easy, but 100% manageable, and I had option to drop lowest 2 or 3

Respected
Caring
4.0
3.0
MATH309
Grade: A
Apr 18, 2021
Would take again

The hate for Schaefer isn't warranted especially if you take his classes in person. You can really tell that he cares about his students and makes an effort to answer any and all questions in class (and gives comprehensive and thorough answers on Piazza). Very good, likable guy. Exams aren't too bad but sometimes are a bit conceptual. Good lectures

Accessible outside class
Clear grading criteria
Caring
4.0
3.0
MATH233
Grade: A
May 11, 2021
Would take again

Despite his poor handwriting, I thought Prof. Schaefer explained concepts pretty well, or at least well enough for me to understand them for the quizzes. Quizzes every week can be annoying but ensures you are cumulatively understanding the information. He is very accessible and willing to help, and the workload overall is pretty standard.

Accessible outside class
Test heavy
Lecture heavy
5.0
3.0
MATH309
Grade: A+
Jul 23, 2021
Would take again

I love this man. He taught this course hybrid during covid, allowing students to come in. He really made a difference, easily the best course I took the semester. Very good lecturer, I can tell he really cares. If his ratings are low it is because the class is hard, not because he is a bad teacher - he is far from that.

Respected
Amazing lectures
Caring
5.0
2.0
MATH132
Oct 14, 2021
Would take again

Best math professor I've had so far.

Gives good feedback
Amazing lectures
5.0
4.0
MATH132
Grade: Not sure yet
Oct 21, 2021
Would take again

An amazing person and professor. Although Calc II is by no means an easy class lectures are well planned, well-paced, run smoothly and prepare you for the homework and quizzes. Professor Schaefer seems to get the perfect balance of time for questions, lecture, and the time seems to really fly by. It is clear that he cares and wants you to succeed.

Clear grading criteria
Amazing lectures
Caring
5.0
3.0
MATH132
Grade: A
Oct 29, 2021
Would take again

I know people that watch all of Schaefer's lectures on top of going to their Calc II professor's class because he is so great at teaching. On top of that he is just a great guy. He also cares a lot about his students and is VERY receptive to feedback. He goes above and beyond to make the class enjoyable. Couldn't recommend more, 10/10!

Participation matters
Amazing lectures
Caring
5.0
2.0
MATH100
Grade: Not sure yet
Nov 5, 2021
Would take again

Genuinely a great math professor who cares about the success of his students. Easy to follow along with and is always willing to answer questions

Gives good feedback
Accessible outside class
Clear grading criteria
4.0
3.0
MATH132
Nov 3, 2021
Would take again

I found this class difficult but Professor Schaefer's lectures were great. Lots of examples to refer back to.

5.0
3.0
MATH132
Grade: Not sure yet
Dec 9, 2021
Would take again

Professor Schaefer is a great teacher. He really understands the material and presents it in a pretty easy way to understand. The homework makes up for a fair portion of the grade so the grades aren't solely based on exams. Overall, great class and he is very inclusive and cares about his students.

Clear grading criteria
Amazing lectures
5.0
3.0
MATH132
Grade: Not sure yet
Dec 16, 2021
Would take again

I would highly recommend taking calculus with Dr. Schaefer. His lectures are dynamic and clear, he is super responsive to students (responds to Piazza posts almost every day), and obviously really cares about the wellbeing of his students. While the transition to college math wasn't super easy, I really enjoyed taking calc 2 with Schaefer.

Respected
Accessible outside class
Clear grading criteria
5.0
3.0
MATH132
Grade: A
Dec 22, 2021
Would take again

Schaefer was an amazing professor. He explained concepts amazingly and you can tell he cares about his students. He does so much for the math department and gives good material to study from.

Accessible outside class
Clear grading criteria
Amazing lectures
5.0
3.0
MATH132
Grade: A
Dec 26, 2021
Would take again

This man is one of a kind, especially in the math world. I have never had a more incredible math teacher than him. He explains difficult concepts very clearly and cares deeply about his students. If you are taking calc 2, definitely take his section or else you'll be confused.

Accessible outside class
Skip class? You won't pass.
Caring
5.0
3.0
MATH132
Grade: A+
Jan 3, 2022
Would take again

Prof. Schaefer is INCREDIBLE. He made me smile every day and made every class engaging & enjoyable. The way he teaches concepts makes them very easy to understand, and hes quick to respond on piazza when students need help. He genuinely gets joy out of teaching math, and it shows. He really cares about students, and hes great to talk to. 100/10.

Accessible outside class
Amazing lectures
Caring
5.0
4.0
MATH132
Grade: A
Jan 14, 2022
Would take again

great professor. fast paced, but also easily accessible for questions

Gives good feedback
Respected
Lots of homework
5.0
4.0
MATH132
Grade: A+
Jan 16, 2022
Would take again

Dr. Schaefer is special. He goes out of his way to help his students understand concepts, is very accessible outside of class, gives amazing lectures that are easy to follow and take notes on, and has a genuine passion for math. A good math professor makes all the difference in a math class. If you can, take a class with Dr. Schaefer.

Accessible outside class
Amazing lectures
Caring
5.0
3.0
MATH132
Grade: A
Jan 19, 2022
Would take again

Charismatic and fun, so lectures are always interesting. Goes the extra mile to make sure all student questions are answered, especially staying a few hours late in office hours.

Accessible outside class
Skip class? You won't pass.
Amazing lectures
5.0
3.0
MATH132
Grade: A
Jan 18, 2022
Would take again

amazing professor. never thought math was my thing, but he honestly made me love calculus so much that i plan to become a peer leader to tutor others.

Lots of homework
Accessible outside class
Amazing lectures
5.0
4.0
MATH132
Grade: B+
Jan 25, 2022
Would take again

Schaefer was a fun calc teacher -- engaging in class and does a good job explaining concepts. I watched his recorded lectures so I could slow things down, which was fine because participation/attendance isn't necessary. Homework was manageable with unlimited attempts and quizzes were straightforward. Exams were fine but the final was hard.

Respected
Hilarious
Caring
5.0
3.0
MATH132
Grade: A+
Jan 28, 2022
Would take again

Professor Schaefer is simply a legend. Brilliant and rngaging lectures plus he always adds a little bit of levity to the class and is all around a little bundle of joy. Will continue to take classes with him.

Gives good feedback
Accessible outside class
Amazing lectures
5.0
3.0
MATH132
Grade: A
Jan 31, 2022
Would take again

Prof Schaefer is the goat, best Calc 2 prof at washu. Great lectures and very caring prof. Webwork is fairly chill and exams are not outrageously hard.

Accessible outside class
Caring
5.0
2.0
MATH233
Grade: A
Mar 29, 2022
Would take again

A pure legend. Probably the most legendary Professor I've had in college. A hilarious, brilliant teacher, who is extremely considerate and thoughtful, who ensures everyone understands and is super duper conceptual. A great teacher, and a great person!

Inspirational
Hilarious
Caring
5.0
3.0
MATH233
Grade: A+
Apr 14, 2022
Would take again

Professor Schaefer is probably the best professor I've ever had. He explains topics very well, has a great sense of humor, and is willing to put in extra time to help students understand the material. His class is a large reason why I have an interest in taking more math classes and possibly even pursuing a minor. I would take his class 100 times

Inspirational
Hilarious
Caring
5.0
3.0
MATH233
Apr 15, 2022
Would take again

Professor Schaefer is really good at what he does; some professors teach without understanding that they were once in our shoes but Schaefer is patient and answers all questions. He makes hard concepts easy to understand and you can tell he really loves doing what he does! He is also funny and makes lectures enjoyable.

Amazing lectures
Inspirational
Caring
5.0
2.0
MATH233
Grade: A
Apr 18, 2022
Would take again

he coo

4.0
1.0
MATH233
Grade: A
Apr 24, 2022
Would take again

Karl's great with Calc 2, where he was able to give very very good lectures. But Calc 3 is a little bit of a hustle, as sometimes we struggle to get everything covered and end up only with one example given, which makes the prcoess a little more challenging. Definitely look out for online instructions and stuff like that for 233.

Hilarious
Caring
Test heavy
5.0
2.0
MATH233
Grade: A
May 6, 2022
Would take again

one of the best professors out of any STEM course I've taken so far; engaging and easy to follow lectures; Schaefer's lectures have great pace, often pausing to let us absorb the information; very active on the Piazza; provides extremely helpful practice exams that basically mimic the real ones; 1000% recommend

Amazing lectures
5.0
2.0
MATH233
Grade: A
May 6, 2022
Would take again

Schaefer is probably one of the best professors at WashU. They reply to piazza post with thorough, helpful explanations. In lecture, they review old concepts to make learning new things easier. Pace of class is perfect. Schaefer's lectures are so clear and articulate that you can figure out even abstract problems. Practice exams are like real ones.

Amazing lectures
Caring
Online Savvy
5.0
3.0
MATH233
Grade: A
May 6, 2022
Would take again

Best professor I have had the pleasure of working with yet. He is not only a wonderful person, but truly cares for and respects every student that he has and genuinely wants to help everyone succeed. Explanations in lecture were fantastic and he was always accessible outside of lecture or on piazza to answer questions.

Clear grading criteria
Gives good feedback
Accessible outside class
5.0
2.0
MATH233
Grade: A
May 14, 2022
Would take again

One of the best professors, he understands his students very well and is cares about each one individually.

Amazing lectures
Caring
Accessible outside class
5.0
3.0
MATH132
Grade: A
May 16, 2022
Would take again

I am just adding to the already positive reviews, but seriously Schaefer is an amazing professor. He clearly exemplifies what it means to be a professor. He is always upbeat, engaging with his students, and is absolutely stellar at explaining concepts in class and on Piazza where he will answer questions quickly. Practice exams reflect real exams.

Inspirational
Caring
Graded by few things
5.0
2.0
MATH233
Grade: A
May 24, 2022
Would take again

The absolute best and the reason I'm a math major now!

EXTRA CREDIT
Gives good feedback
Caring
5.0
3.0
MATH132
Grade: Rather not say
Jun 9, 2022
Would take again

Great professor. Professor Schaefer genuinely cares about his students and is willing to stay/meet with you for extra help. His lectures are also very clear. Would recommend any classes with him.

Amazing lectures
Caring
Respected
5.0
3.0
MATH132
Grade: A
Oct 21, 2022
Would take again

Professor Schafer is genuinely the best lecturer I have had. He is so interactive and makes lecture extremely fun to attend. He is so funny and class is so chill but at the same time I have learned so much from him. He makes the information extremely digestible. I always look forward to attending his class and have literally never missed it once.

Amazing lectures
Inspirational
Hilarious
5.0
3.0
MATH233
Grade: Not sure yet
Nov 13, 2022
Would take again

Karl Schaefer is one of the best teachers I've ever had. He's great at explaining the material, and he's such a likable guy even if you don't like the class itself. I felt compelled to write this review just so he knows that non-math majors appreciate him more than he can imagine.

Amazing lectures
Hilarious
Caring
5.0
3.0
MATH132
Grade: A-
Nov 15, 2022
Would take again

Such a sweet human, very obvious that he cares about his students and listens to feedback. 100% would recommend

Hilarious
Caring
Respected
5.0
3.0
MATH132
Grade: A-
Nov 16, 2022
Would take again

Schaefer is clearly the best Calc 2 professor, it isn't really close. Hes an amazing guy and cares about his students, even if there are more than 100 students in each of his classes. Tests are reasonable based on the lectures, the only thing I find a little unreasonable is the Webwork.

Caring
Lecture heavy
Test heavy
5.0
2.0
MATH132
Grade: A-
Nov 18, 2022
Would take again

No one was ever able to explain p-series like Schaefer does. 1 hour lectures feel like 10 minutes. Schaefer and Johnson probably best math professors I've ever come across. P.S. Hi Schaefer's Mom! Your son is so good at lecturing it's crazy :)

Amazing lectures
Inspirational
Respected
5.0
3.0
MATH132
Grade: A
Nov 16, 2022
Would take again

Professor Schaefer is AMAZING. 'Nuff said.

5.0
3.0
MATH132
Grade: Not sure yet
Nov 28, 2022
Would take again

The reviews speak for themselves. Although he's great at lecturing and explaining difficult topics better than any prof/teacher I've ever had, the most important thing about Schaefer is that he cares about all of his students. For such a huge course (200+ students), he'll happily meet 1:1, respond to emails/piazza within the hour, etc.

Amazing lectures
Caring
Accessible outside class
5.0
1.0
MATH132
Grade: A+
Dec 9, 2022
Would take again

Schaefer is an incredibly effective and fun lecturer. His engagement with his students is unparalleled from what I have seen, and he has a great talent for de-mystifying mathematics for people of all backgrounds and abilities. Homework is very reasonable and engaging with subsections and practice exams will practically guarantee you a good grade.

Amazing lectures
Inspirational
Respected
5.0
2.0
MATH132
Grade: B
Dec 13, 2022
Would take again

Made calc easy to understand and had very energetic lectures. Tried to include students in lecture as mush as possible by asking questions (both fun and material related)

Amazing lectures
Caring
Lecture heavy
5.0
3.0
MATH132
Grade: A
Dec 10, 2022
Would take again

Professor Schaefer is seriously an amazing teacher. You can truly tell he cares about his students and is great at relaying the content. He makes lectures interesting and is obviously passionate about math. I seriously recommend taking him!!!

Amazing lectures
Hilarious
Caring
5.0
2.0
MATH132
Grade: A-
Dec 13, 2022
Would take again

There is no better professor at Washu than Schaefer truly passionate about what he teaches and clearly explains the topics. You emailed him almost anytime of day and he'll almost instantly respond. He also goes above during office hours staying an extra hour multiple times just to answer questions.

Hilarious
Caring
Accessible outside class
5.0
4.0
MATH233
Grade: B+
Dec 14, 2022
Would take again

Dr. Schaefer is the best professor I've ever had. He is an incredible teacher and an incredible human being. He really cares about his students. He is willing to do anything to help his students succeed.

Amazing lectures
Inspirational
Caring
2.0
4.0
MATH132
Dec 15, 2022

This may be a hot take, but although he is a nice person, he is not a good teacher. I don't feel like I learn from his lectures and learned more from outside resources or attending the other section. He goes over very simple problems that don't prepare you for the homework.

5.0
4.0
MATH132
Grade: Not sure yet
Dec 19, 2022
Would take again

Professor Schaefer is the best teacher I have ever had. His lecture style effectively conveys information without being dry, as he consistently interacts with students and keeps the mood light. He is incredibly kind and giving with his time outside class, and spent an entire day on piazza before the exam giving exhaustive help. A true king.

Clear grading criteria
Caring
Accessible outside class
5.0
2.0
MATH132
Grade: A+
Dec 16, 2022
Would take again

Schaefer's class is a must-take

Amazing lectures
Hilarious
Respected
5.0
5.0
MATH132
Grade: B+
Dec 20, 2022
Would take again

Schaefer cares so much about his students, and it really shows. He does so much to help students and responds quick to questions via Piazza. But I felt that math 132 wasn't really meant for students who haven't taken BC calc or WashU calc 1. I took AB in high school, and did fine for the most part, but REALLY struggled when it came to midterm 3.

Caring
Test heavy
Accessible outside class
5.0
1.0
MATH132
Dec 27, 2022
Would take again

He is very clear, patient and kind. Overall, he teaches very well.

5.0
3.0
MATH132
Grade: A-
Jan 9, 2023
Would take again

great teacher, caring, approachable, and overall the BEST professor I have ever had.

Inspirational
Caring
Accessible outside class
5.0
3.0
MATH132
Grade: A
Jan 18, 2023
Would take again

Mr. Schaefer is of no doubt one of the most amazing math teachers I have ever had. He did such a wonderful job explaining concepts and preparing students for exams. The exams were very fair as long as you study and pay attention in class. His sense of humor also made the classes very easy to get through.

Amazing lectures
Caring
Accessible outside class
5.0
2.0
MATH100
Grade: A
Jan 26, 2023
Would take again

He is seriously the nicest prof ever! He was so helpful to me in office hours. He really cares about his students. People used to sit on the floor of his full lectures because he was so good. He is so funny and ask him about his cat!

Gives good feedback
Hilarious
Accessible outside class
5.0
3.0
MATH233
Grade: A
Apr 16, 2023
Would take again

Prof Schaefer is seriously the greatest! Everyone comes to his sections regardless of what class they are actually enrolled in. He is by far the best prof I have ever had and I am sure he has contributed to many people taking a math major/minor. Makes content understandable and enjoyable. Even if you don't like math go sit in a few of his classes!

Amazing lectures
Inspirational
Accessible outside class
5.0
3.0
MATH132
Grade: A+
Apr 21, 2023
Would take again

AMAZING professor. Lectures are so understandable, he excels at explaining concepts. Taking AP calc AB in high school did help at first but we quickly learned past AB content. Doing well on exams is extremely doable with the amount of practice available (all the past exams). You see patterns in the test questions.

Amazing lectures
Inspirational
Respected
5.0
3.0
MATH233
Grade: A-
May 2, 2023
Would take again

One of the best Profs I've ever had. Very concise and understandable. Also just a genuinely great person. Cares about students.

Amazing lectures
Caring
Respected
5.0
2.0
MATH233
Grade: A+
May 5, 2023
Would take again

He is an extremely charismatic professor, and he is very passionate about what he teaches. He is one of the greatest professors I have had in my first year.

Caring
Respected
Graded by few things
5.0
3.0
MATH233
Grade: A
May 9, 2023
Would take again

Schaefer is easily one of WashU's best professors. I took calc III not because I needed to, but just so I could take another class with him after taking Calc II. Incredibly clear lecturer, devoted and patient in office hours, and really kind. His love for the subject is infectious, even if math or calculus isn't your favorite.

Amazing lectures
Respected
Graded by few things
3.0
4.0
MATH233
Grade: Not sure yet
May 9, 2023

He is a nice person, but I don't think his exams are well done. He consistently gives practice exams that aren't as hard as the exam. Having practice exams that actually mirror the type of content that will be on the exams, especially the more conceptual ideas, would be very helpful. The final was also way too long, & needed more than two hours.

Respected
Graded by few things
Accessible outside class
5.0
3.0
MATH4351
Grade: A+
May 12, 2023
Would take again

Schaefer is definitely one of the best math professors at WashU! Humorous and gives very clear lectures. Very helpful in office hours. I really enjoyed taking this class with him.

Amazing lectures
Respected
Accessible outside class
5.0
3.0
MATH132
Grade: A
May 16, 2023
Would take again

G.O.A.T

Amazing lectures
Respected
Accessible outside class
5.0
3.0
MATH233
Grade: A
May 16, 2023
Would take again

Schaeffer is really caring about students, he makes little jokes, but he also teaches math extremely well. I love my notes from this class because he draws such interesting pictures on the board. All the material is made very clear. If you miss a lecture, it doesn't matter because all the lectures are recorded and posted. Love this guy.

Clear grading criteria
Caring
Online Savvy
5.0
2.0
MATH233
Grade: B+
Jun 1, 2023
Would take again

Amazing prof. Great lectures and was able to get help when needed

Amazing lectures
Clear grading criteria
Lecture heavy
5.0
3.0
MATH233
Grade: A
Jun 21, 2023
Would take again

Professor Schaefer is genuinely one of the best teachers I've ever had. His lectures are engaging and super clear, and his in-person office hours are really helpful. Webwork is a bit annoying, but the exams are not as hard as the webwork questions. I had him for both calc 2 and calc 3, and would definitely recommend taking both classes with him!

Amazing lectures
Accessible outside class
5.0
2.0
MATH132
Aug 29, 2023
Would take again

Made Calc 2 super simple and easy to understand

Amazing lectures
Clear grading criteria
Accessible outside class
5.0
4.0
MATH132
Grade: A
Dec 3, 2023
Would take again

Karl Schaefer is the best math teacher I have ever had. Calc II is easy with his lectures and he is one of the nicest professors on campus. The class structure gives you tons of resources and Piazza is amazing for figuring out tough questions. TAKE CALC II with SCHAEFER!

Amazing lectures
Clear grading criteria
Online Savvy
5.0
4.0
MATH132
Grade: A+
Nov 7, 2023
Would take again

So worth the hour of reloading the page during registration to get into his class

Amazing lectures
Gives good feedback
Lecture heavy
5.0
3.0
MATH100
Grade: Not sure yet
Dec 7, 2023
Would take again

I really appreciated that Shaefer really seemed to care that his students understood the concepts and I really liked the class grading system. It was a very collaborative vibe and he is just very kind.

Clear grading criteria
Caring
Accessible outside class
5.0
2.0
MATH233
Grade: A
Dec 4, 2023
Would take again

He is THE man

Inspirational
Hilarious
Caring
5.0
3.0
MATH132
Grade: A
Dec 8, 2023
Would take again

Nicest and best math teacher I've ever had. I love this man with my entire soul and wished he taught other courses that I'm taking.

Amazing lectures
Hilarious
Caring
5.0
2.0
MATH132
Grade: A
Dec 9, 2023
Would take again

He is an amazing lecturer and makes every topic really clear. Tests were extremely fair and there are so many resources to succeed. Would definitely take Calc 2 with Schaefer or watch his online lectures.

Amazing lectures
Clear grading criteria
Accessible outside class
5.0
3.0
MATH132
Grade: Rather not say
Dec 13, 2023
Would take again

Best professor to have for this course! He goes in-depth about the material and his examples, and he's also sort of visual. Will answer all your questions clearly and make sure you understand his answer. You'll leave the lecture understanding the material more than being confused by it if he's teaching it.

5.0
3.0
MATH132
Dec 13, 2023
Would take again

Professor Schaefer is an amazing professor who really makes you appreciate the beauty of calculus. Lectures are clear and generally easy to follow, and he's very active on Piazza, an online discussion forum for course-related questions. He always carries a positive vibe around him, and you can tell that he genuinely cares about his students.

Amazing lectures
Caring
Accessible outside class
5.0
4.0
MATH132
Grade: Not sure yet
Dec 15, 2023
Would take again

Professor Schaefer is easily the best professor in WashU.

Amazing lectures
Lots of homework
Hilarious
5.0
2.0
MATH132
Dec 19, 2023
Would take again

He's one of the best math teachers I have. He made calc 2 a little easier and he cares about his students. His lecture are amazing and he knows what he's doing

Amazing lectures
Hilarious
Accessible outside class
5.0
3.0
MATH132
Grade: A-
Dec 19, 2023
Would take again

Prof Schaefer is a super compassionate to student needs! Always rooted in logic and numbers but will accomodate student needs if you advocate for yourself. Great lecturer -- though you do not need to be enrolled in his section to listen to his lectures. Lectures always recorded and posted online same day.

Amazing lectures
Test heavy
Accessible outside class
5.0
3.0
MATH132
Grade: A
Dec 19, 2023
Would take again

If you need to take Calc I, II, or III please take it with Schaefer. He is the best math professor I have had and he just really wants everyone to succeed. Super sweet, funny, and will be there if you seek him. I have nothing bad to say about him, and the course is super fair.

Amazing lectures
Caring
5.0
4.0
MATH132
Grade: A
Dec 22, 2023
Would take again

He does a phenomenal job explaining the all the content for the course in a relatively small amount of time. I don't think anyone could do a better job teaching this course. There is definitely a heavy load outside of class to prepare yourself but totally doable.

Amazing lectures
Clear grading criteria
Test heavy
5.0
2.0
MATH132
Grade: A+
Dec 21, 2023
Would take again

Schaefer's lectures are very good, and he's always available outside class to help! There are many resources you can use if you are struggling with calculus. He makes class enjoyable, just make sure to do your homework and quizzes and study for the exams.

Amazing lectures
Clear grading criteria
Caring
5.0
3.0
MATH132
Grade: B-
Jan 2, 2024
Would take again

He is such an amazing professor, even though I didnt go to class, i still learned so much. As much as I wouldnt want to do calc 2 again, I would do it if he were teaching. tests are reflective of what you learn in class, and homework actually makes u learn. i hope him and his partner are happy listening to lana del rey.

Amazing lectures
Lots of homework
Test heavy
5.0
3.0
MATH132
Jan 10, 2024
Would take again

While Calc 2 is generally a tough class, Schaefer made lectures super enjoyable, and his writing was always clear and easy to follow. As someone who didn't take any AP-level calc is hs, the class content was pretty difficult to get the hang of, but as long as you go to lectures (or watch them after class), you should be fine.

Hilarious
Test heavy
5.0
3.0
MATH132
Grade: A+
Jan 2, 2024
Would take again

Schaefer is an incredibly skilled educator and you should do your best to take calc with him, even if it means waiting a semester. He is concise and efficient, clear, and caring.

Amazing lectures
Respected
Accessible outside class
5.0
3.0
MATH132
Grade: A+
Jan 11, 2024
Would take again

good professor and clear lectures. make sure you pay attention because they'll try to trick you on tests. would definitely reccomend.

Amazing lectures
Caring
5.0
3.0
MATH132
Grade: A
Jan 12, 2024
Would take again

BEST LECTURER. Believe the reviews. He's kind, interesting, and a teacher who truly cares about you understanding the material and how comfortable you feel with it. He is always willing to help if you ask!!!! I wish I went to more of his office hours.

5.0
1.0
MATH100
Grade: A-
Jan 15, 2024
Would take again

Schaefer is one of the best teachers I've ever had. He made sure to be available outside of class and did a great job of supporting my class' varying levels of learning. He's responsive, funny, a great lecturer, and his cats are the cutest.

Amazing lectures
Gives good feedback
Respected
5.0
3.0
MATH132
Grade: A+
Jan 18, 2024
Would take again

Schaefer is an incredibly skilled educator. He's a funny and caring guy, and he's great at math. He builds an intuitive understanding that I feel respects pure mathematics, and also acknowledges the relevant applications (especially relevant in Calc II imo). I think you should do everything in your power to take calc with Schaefer.

Amazing lectures
Clear grading criteria
Respected
5.0
3.0
MATH4351
Grade: A
Feb 1, 2024
Would take again

Schaefer is the actual GOAT of the math department. 4351 is my favorite math class I've taken here, and it's all due to Karl. If he's teaching a class you want to take, then take it. He is a generational talent in the math department.

Amazing lectures
Hilarious
Caring
5.0
3.0
MATH132
Grade: B+
Apr 19, 2024
Would take again

Who doesn't love Schaefer? PS solve the practice exams since they are super similar to actual exams!!!

Amazing lectures
Clear grading criteria
Hilarious
5.0
3.0
MATH233
Grade: A
Apr 26, 2024
Would take again

He is an all-time great in the WashU math department. This is unfortunately the last class I will get to take with him but he will forever be one of my favorite teachers here at WashU.

EXTRA CREDIT
Amazing lectures
Clear grading criteria
5.0
3.0
MATH132
Grade: A+
Apr 27, 2024
Would take again

The best math professor at WashU.

Amazing lectures
Clear grading criteria
Inspirational
5.0
3.0
MATH233
Grade: Not sure yet
Apr 28, 2024
Would take again

Professor Schaefer is the goat of calculus at WashU. Clear and concise lectures, easygoing and humorous personality, and is always happy to help. You can feel that you're learn so much after every single lecture.

Amazing lectures
Hilarious
Caring
5.0
3.0
MATH233
May 1, 2024
Would take again

Live laugh love Schaeffer

5.0
3.0
MATH233
Grade: A
May 10, 2024
Would take again

One of the best lecturers I've ever had.

Amazing lectures
Clear grading criteria
Caring
5.0
3.0
MATH233
Grade: A+
May 13, 2024
Would take again

Take Schaefer if you can, and if you can't, just go to his lectures or watch them online. His lectures are very engaging and he teaches calculus in the easiest way to understand as possible. He's also a very fun and sweet guy.

Amazing lectures
Test heavy
Accessible outside class
5.0
2.0
MATH233
Grade: A+
May 10, 2024
Would take again

Schaefer's so kind and sweet. Makes an effort to connect with the class and learn names. On top of that, great lecturer and is excited to answer questions. In office hours, he'll explore material deeply with you. Not enough partial credit on MC exams, but other than that, he's one of my fav professors and makes me want to pursue math more. Calc 2+3

Amazing lectures
Caring
Test heavy
4.0
4.0
MATH233
Grade: B+
May 15, 2024
Would take again

Schaefer is a really good calc professor. If you can, take calc 2 +3 with him, you will do a lot better that way. I will say, it would be nice if there was more partial credit on exams, but that's a math department problem, not a schaefer problem.

Test heavy
Graded by few things
Accessible outside class
5.0
4.0
MATH233
Grade: A
May 22, 2024
Would take again

Professor Schaefer is an amazing Professor. He is very organized and gives practice tests and quizzes to help people succeed.

Amazing lectures
Clear grading criteria
Accessible outside class
5.0
2.0
MATH233
Grade: A+
Jun 5, 2024
Would take again

Schaefer remains unparalleled for Calculus lectures. Precup was also very good.

Amazing lectures
5.0
4.0
MATH310W
Grade: A
Jun 5, 2024
Would take again

Schaefer is a very skilled educator and he is very qualified to teach the sensitive 310W. Schaefer's 310 included a good coverage of foundational topics. The class is very difficult, that's just the nature of it. Schaefer doesn't seem to hold punches but still gives exceptional lectures and is very accessible and helpful outside of class.

Amazing lectures
Accessible outside class
5.0
2.0
MATH233
Grade: B+
Jun 15, 2024
Would take again

Probably one of the best math professors at wash

5.0
2.0
MATH233
Grade: A
Sep 6, 2024
Would take again

Best Professor I've Ever Had. He explains complex concepts with such clarity and depth that everything feels understandable. What truly sets him apart is how deeply he cares about his students. His kindness and compassion create an incredibly supportive learning environment. On top of that, he's hilarious, making class not only informative but fun!

Inspirational
Hilarious
Caring
5.0
3.0
MATH132
Grade: Not sure yet
Sep 27, 2024
Would take again

Schaefer is an inspiring and caring individual who deserves the world. His passion for math is unmatched, and he's always available for conversation outside of class. His explanations for problems are always perfect. His kindness and warmth are rare, and I will never forget him. Thank you for everything you do for your students!

Amazing lectures
Caring
Respected
5.0
3.0
MATH132
Oct 12, 2024
Would take again

Professor Schaefer's lectures are clear and engaging, which makes understanding difficult math concepts easier. He is also very accessible outside of lectures and provides online resources like practice exams for us to succeed.

Amazing lectures
Caring
Accessible outside class
5.0
2.0
MATH132
Grade: A+
Oct 15, 2024
Would take again

Such a fun class. Can always email with questions and he replies instantly!

Caring
Respected
Accessible outside class
5.0
3.0
MATH132
Grade: A
Oct 24, 2024
Would take again

Schaefer is the best professor for Calc classes. The materials he taught and the tricks he gave are so useful on exams and I am pretty sure that the other professors do not give the same tricks. And the exams are written by Schaefer so you should totally take him.

Amazing lectures
Accessible outside class
5.0
2.0
MATH132
Grade: A
Nov 11, 2024
Would take again

Best Calc Prof. Super clear and engaging lectures and always takes time to ask for questions. Even if you don't get him, many people will go to his lectures anyway (or you can watch them after he posts them on Fridays). So much support. 10/10

Amazing lectures
Clear grading criteria
Accessible outside class
5.0
3.0
MATH132
Grade: A
Nov 25, 2024
Would take again

Really good professor. Teaches well and clearly cares about his students.

Amazing lectures
Lots of homework
Respected
5.0
3.0
MATH132
Grade: Not sure yet
Dec 12, 2024
Would take again

Don't listen to that last review. Schaefer is by far the best professor I've had this semester, and he's done a great job at teaching calculus. He also encourages questions and class participation in a way that doesn't feel forced. Definitely a nice guy and a great professor.

Amazing lectures
Caring
Test heavy
5.0
3.0
MATH132
Grade: A
Dec 6, 2024
Would take again

Fair exams, enjoyable lectures, available for questions. If you put in the work you should get the grade.

EXTRA CREDIT
Inspirational
Hilarious
5.0
3.0
MATH132
Grade: A+
Dec 13, 2024
Would take again

Calc 2 is a hard class. Schaefer teaches it in probably the easiest way (for the student) it can be. He emphasizes intuitive problem-solving methods and has EXTREMELY organized lectures to illustrate those intuitive methods. If algebra is the cause of most of your mistakes, do some outside review: the lectures move too fast to address those issues.

5.0
3.0
MATH132
Grade: A+
Dec 16, 2024
Would take again

Genuinely nice guy and makes the difficult class as easy as it can be. Records and posts all of his lectures and is so organized in his teaching methods.

Amazing lectures
Caring
Online Savvy
3.0
3.0
MATH132
Grade: B+
Dec 17, 2024
Would take again

only goes through a few problems during lectures, needs more practice questions. exams are reasonable but tough

Amazing lectures
Clear grading criteria
Lecture heavy
5.0
3.0
MATH132
Grade: A-
Dec 17, 2024
Would take again

great lecturer! hard class but workload was reasonable

5.0
2.0
MATH132
Grade: A
Dec 18, 2024
Would take again

He wasn't even my professor, but I attended all his lectures starting the second week. He was super easy to understand, and I am taking his class again for Calc 3. I would recommend you go to his lectures if you can.

Amazing lectures
Clear grading criteria
Accessible outside class
5.0
3.0
MATH132
Grade: A+
Dec 18, 2024
Would take again

I really enjoyed taking Calc 2 with Schaefer! The class is well organized and very thoughtfully put together. I appreciated that he took the time to get to know his students, too. He's very thorough when presenting material and is great at explaining concepts. Lectures always felt like “stories” and were very interesting :)

Amazing lectures
Caring
Accessible outside class
5.0
2.0
MATH132
Grade: A+
Dec 20, 2024
Would take again

love love love love love love he's such a goat take him

Amazing lectures
Inspirational
Hilarious
5.0
2.0
MATH132
Grade: A
Dec 21, 2024
Would take again

I struggled with Calculus I in high school, so I was nervous about Calc II. However, Schaefer's clear and direct lectures made the course smooth and easy to follow. His effective instruction helped me understand the material well. With consistent effort, this class can be very manageable and rewarding. He's genuinely the goat teacher.

Amazing lectures
Respected
Accessible outside class
5.0
2.0
MATH132
Grade: A+
Dec 22, 2024
Would take again

Dr. Schaefer was truly a great professor. His lectures were easy to follow, he was approachable and open to students in any section who needed help. I am pleased to have had him as a professor and—while I'm not a math major—he makes me want to take another math course with him in the future!

Amazing lectures
Clear grading criteria
Gives good feedback
5.0
3.0
MATH132
Grade: A+
Dec 23, 2024
Would take again

Great professor, clear lectures and easy to understand

Caring
Respected
5.0
2.0
MATH132
Grade: A
Dec 26, 2024
Would take again

Schaefer is easily the best teacher for any math class in general. He's genuinely interested in math, and it's a little contagious at times. Schaefer speaks very articulately, and he wants to ensure that everyone succeeds. He cracks jokes, incentivizes class participation, and describes the schedule when needed. Take his class if you can.

Gives good feedback
Caring
Respected
5.0
4.0
MATH132
Grade: A-
Dec 28, 2024
Would take again

I love this man he is the coolest Calc 2 Professor!

Amazing lectures
Gives good feedback
Respected
5.0
3.0
MATH132
Grade: B+
Dec 30, 2024
Would take again

Easy to approach and very friendly. Am already registered to have him again next semester!

Amazing lectures
Respected
Accessible outside class
5.0
2.0
MATH132
Grade: A
Dec 31, 2024
Would take again

Took Calc II with Schaefer after over a year since taking Calc I in high school. Eases into the semester with review topics before introducing new material. Explains everything very clearly and provides lots of examples Exams are very similar to practice exams.

Amazing lectures
Respected
5.0
4.0
MATH310
Grade: A+
Jan 13, 2025
Would take again

Schaefer taught MATH310 with a lot of passion and really showed us those cute proofs. Tests are reasonable, but hard to study for. Get ready to spend a lot of time on homework and lots of writing (get that notebook ready). That being said, super rewarding and interesting material. It will teach you the ins and outs of math like never before.

Inspirational
Lots of homework
Lecture heavy
5.0
3.0
MATH233
Grade: A
Jan 23, 2025
Would take again

Schaefer is a phenomenal calculus professor. His lectures are engaging, and he genuinely cares about student success. For study prep, I found unstuckstudy and the textbook very helpful.

5.0
1.0
MATH132
Grade: A
Feb 14, 2025
Would take again

u know how most maths teachers became math teachers because they're bad at maths and just got stuck teaching it? NOT Schaefer. Bros actually an angel sent from the heavens...

Amazing lectures
Caring
Respected
5.0
3.0
MATH132
Mar 7, 2025
Would take again

Good lecturer.

5.0
3.0
MATH132
Grade: B-
Apr 9, 2025
Would take again

I took Calc2 in the spring. he doesn't even teach it in the spring. My professor was so bad I found myself watching Schaefers lectures online instead. 10/10 helped me learn the material. (I struggle in math)

Amazing lectures
5.0
1.0
MATH132
Grade: A+
Apr 18, 2025
Would take again

I trust Schaefer's teaching more than myself. Always watch his recordings for Calc II, and am currently in his Calc III. You'll be lucky if he teaches your class that semester. He literally teaches what is going to appear on the homework section (if it is Webwork's problem, blame Webwork but not Schaefer) and the exam. The saint of WashU math.

5.0
3.0
MATH233
Grade: A
Apr 29, 2025
Would take again

Superb lecturer and extremely nice guy. Tests can be tricky sometimes but never unreasonable (practice exams are super helpful study tools). Homework done through WebWork, which can give you some pretty nasty problems, but that's more so an issue with the website than with any of the professors.

Amazing lectures
Hilarious
Accessible outside class
5.0
3.0
MATH233
Grade: A
Apr 29, 2025
Would take again

Pretty strong consensus that Schaefer is one of the best professors at WashU. Schaefer, my love, my muse, my light. Thank you for being so kind and caring. Genuinely a great guy and clearly cares about his students. Take him if possible.

Amazing lectures
Caring
Respected
5.0
2.0
MATH132
Grade: A+
May 3, 2025
Would take again

Schaefer is the GOAT

Caring
Respected
5.0
3.0
MATH233
Grade: A-
May 7, 2025
Would take again

Best professor ever. He really cares about you in and out of the classroom.

Amazing lectures
Respected
Accessible outside class
5.0
5.0
MATH132
Grade: A
May 8, 2025
Would take again

Best prof ever

5.0
5.0
MATH132
Grade: A
May 8, 2025
Would take again

Schaefer really cares about his students! One of the best profs at washu

Amazing lectures
5.0
2.0
MATH233
Grade: A
May 9, 2025
Would take again

he truly cares about his students

Amazing lectures
5.0
4.0
MATH4351
Grade: A-
May 10, 2025
Would take again

Favorite class I've ever taken at WashU. Super hard but if you put in the effort, the exam questions are all within reason and Schaefer is more than willing to help you. Never had a professor with a better office hours. He is the absolute best of the math department and would recommend taking any class at all with him. Also super interesting class.

5.0
2.0
MATH4351
Grade: A
May 10, 2025
Would take again

Absolute legend

Hilarious
Caring
Accessible outside class
5.0
1.0
MATH233
May 13, 2025
Would take again

literally my favorite stem prof. funny, caring, and explain hard concepts well and in a digestible manner.

5.0
2.0
MATH233
Grade: A+
May 14, 2025
Would take again

Have had him twice now, what a guy. Made the calc 3 final too hard and proceeded to give the nicest curve and send an essay apologizing. He cares so much.

Caring
Test heavy
Online Savvy
5.0
5.0
MATH233
Grade: A-
May 16, 2025
Would take again

People love him for a reason.

Hilarious
Caring
Respected
5.0
2.0
MATH4351
Grade: A
Jun 22, 2025
Would take again

Schaefer continues to prove that he is a superb educator in both calculus and proof-based courses. I highly recommend him for any class you have the fortune of snagging him for, you will not regret it. This class was quite easy for a math course, but might be challenging if you haven't taken a math course before. I recommend taking 310 first.

Amazing lectures
Caring
Respected
2.0
4.0
MATH132
Grade: B+
Jul 7, 2025

wasn't really good in lecturing, only went through 3-4 problems. exams were okay

4.0
3.0
MATH132
Grade: B+
Jul 10, 2025
Would take again

For Math132 and 233 (Calc II and III). Great professor overall. His lectures can move a bit quickly, but he goes through examples. His office hours are helpful. He's also a genuinely kind professor who truly cares about your learning and well-being as a person. Exams are not bad if you study and practice.

Lots of homework
Caring
Respected
5.0
2.0
MATH132
Grade: A
Oct 9, 2025
Would take again

He's pretty awesome.

Amazing lectures
Clear grading criteria
Caring
5.0
2.0
MATH132
Grade: A
Oct 29, 2025
Would take again

Amazing. Would take his class whenever I could

Amazing lectures
Hilarious
Caring
5.0
2.0
MATH132
Grade: A+
Nov 1, 2025
Would take again

Goat, would recommend Shaefer to everyone. Shaefer can teach my dog math and he would do better than some people in the class. Calc II is supposed to be a difficult lower level math class, but he is great at his job and really cares about his students. Also go to his office hrs, and talk with him. hes the best.

Clear grading criteria
Caring
Respected
5.0
3.0
MATH100
Grade: Not sure yet
Nov 14, 2025
Would take again

While the class is fast-paced, he does a great job of explaining things and always stops for questions. He genuinely cares about his students.

Caring
Respected
Graded by few things
5.0
2.0
MATH233
Dec 9, 2025
Would take again

If you are taking calc 2 or calc 3 at WashU and don't have Schaefer as your professor, I strongly recommend finding someone with access to all of his lecture recordings. Probably the greatest professor at WashU.

5.0
3.0
MATH233
Grade: A
Dec 15, 2025
Would take again

Yes, calc 2 has difficult content, but Professor Schaefer makes the material seem so easy with the way he gives examples and breaks down the questions in lecture. You definitely will succeed in this class as long as you can do the types of problems in the homework and practice exams. Wish I needed to take calc 3 just so I could have Schaefer again

Amazing lectures
Caring
Respected
5.0
4.0
MATH233
Grade: B+
Dec 16, 2025
Would take again

As someone who is not super good at math this class was difficult but Schaefer was a great professor. Excited to have him again next term.

Respected
Graded by few things
Accessible outside class
5.0
2.0
MATH233
Grade: A
Dec 19, 2025
Would take again

Probably the greatest most caring math teacher I've ever had- took him for Calc2 and excited for Calc3 next semester. Even though I would sit in the front and constantly not pay attention, his lectures were so accessible and clear that sometimes I could absorb his explanation at face value and ignore the examples, which math profs can rarely do.

Amazing lectures
Inspirational
Accessible outside class
5.0
2.0
MATH233
Grade: A
Dec 20, 2025
Would take again

Dr. Schaefer was an excellent lecturer! He made Calc II very easy to digest, and tests were fair. It felt like he genuinely cared about students and wanted us to perform well.

Amazing lectures
Respected
5.0
2.0
MATH132
Grade: A
Dec 22, 2025
Would take again

Schaefer is one of the most wonderful teachers I've ever had. He is always happy to help and gives a lot of opportunities for help outside of lectures. If you have the choice, take any one of his classes!

Caring
Respected
Class Info

Online Classes

100%

Attendance Mandatory

6%

Textbook Required

0%

Grade Predictor

Your expected effort level

LowHigh

Predicted Grade

A+

95% confidence
Based on 129 grades
Most common grades:
A (69)
A+ (31)
A- (14)
Grade Distribution
A(100)B(3)C(0)D(0)F(0)A-/B+(26)
Based on 145 reported grades
A: 69
A+: 31
A-: 14
Not sure yet: 14
Common Tags
Amazing lectures (80)
Caring (70)
Accessible outside class (51)
Respected (42)
Clear grading criteria (28)
Hilarious (26)
Inspirational (18)
Test heavy (15)
Rating Trend

Improving

+0.23 avg change
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Ratings by Course

MATH100

5.0

(5)

MATH4351

5.0

(5)

MATH310W

5.0

(1)

MATH310

5.0

(1)

MATH233

4.9

(46)
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Difficulty by Course

MATH310W

4.0

MATH310

4.0

MATH309

3.0

MATH132

3.0

MATH4351

2.8

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