He's a little boring

Willis is the GOAT and it seems that good math professors are lacking at UCLA. If you have the option to get him, take him there's a 99% chance he's better than whoever else you're considering.

Willis is a great professor. His lectures are all very clear and easy to follow. His class notes are also very organized and useful. He cares about students a lot, answer any question in chat during class, and is fast when responding to emails. Exams were very fair in length and not difficult.

BEST MATH PROFESSOR!

Professor Willis is an excellent lecturer and super funny guy in general. Be ready to get clever in this class though, especially on the final. If I could take every math class with Willis I definitely would.

Willis is great. Only teacher I’ve had that didn’t make the midterms more difficult than they otherwise would be in a regular class. Final was a little tough though. Lectures are clear and concise, homework actually build towards the tests. The class is incredibly straightforward. You know exactly what you’re getting, and you’re getting a solid, reasonable math teacher. Would recommend to anyone for any class.

Professor Willis is quite nice and actually pretty good at explaining math. I had to spend a lot of time reading through the textbook to understand concepts, but fortunately the tests were open note which was amazing. The pace of the class was slightly fast, but it was manageable. My TA Kate was very helpful, so definitely go to office hours if you need help. Overall this class is quite doable and I definitely learned a lot.

Hard HW and tests. Very, very helpful and understanding prof. Classes are clear and he will tell the class what all the things are about. Will totally do other classes with him if I can.

I always say that if you need to take a math class, take it with Willis. He is a great professor and the class is overall pretty manageable. He doesn't often go over examples though, since there isn't enough time. Therefore, this class takes a lot of studying on your own in order to do well.

Grade Breakdown:
Homework - 20% (super easy if you use Slader, some were very time consuming. After a certain point, it seems like the TAs do not grade it anymore and give participation points.)
Midterm 1 - 25%
Midterm 2 - 25% (Fair, but one question made the majority of the class lose around 8 points)
Final - 30% (Very difficult, felt like a hate crime, and took 16 hours.)

His exams get very conceptual and there is quite a bit of true false, so make sure to study the more theoretical practice problems towards the end of each section. Also, a lot of the confusing exam questions are pulled straight from the textbook exercises.

Multivariable calculus is hard. This will never be an easy class, but Willis definitely is a safe bet if you need to take it for your major.

This guy literally does not care about multivariable calculus. He's the most useless professor I have ever had. When I went to office hours, and I would ask him a more theoretical question (such as what is the geometric significance of a parametric curve), he would basically throw his hands up and say, classic Willis style:
"I don't know!"
"I guess it's just a thing that mathematicians do. It's the way math was made many years ago. I mean, I don't know. Just accept that this is true, I don't know."

Like, how did this guy get a job here? I don't know.

In all, he's not very helpful, but his tests aren't incredibly hard (though they're not easy). He frequently calls the things he teaches us "terrible", and unexciting. Multivariable calculus is infinitely useful and interesting, but this guy sucks the joy out of the subject and clearly hates what he's teaching.