He was fair most of the time! Midterm was very easy and always tries to cut down on material in order to save time and make the students' lives easier. His final was very hard unfortunately but just study a lot and you'll get well above average. Do the practice problems he posts and go to office hours. I wouldn't take him again but he was alright.

Unfair tester, totally screwed over the class with the final in 6B and 6C apparently. Just take Ernest Freund, he actually knows how to give a fair exam!

Great person, terrible professor. Just demos in his lecture, he even said that his "lectures are complimentary to the book". No amount of studying could prepare for the final, there were at least 8 questions on it that we've never seen before. It was purely to bring down the class average. Said there was going to be 30 questions but there were 38.

Nobody enjoyed this class at all. Long and boring lectures that are extremely off-topic. Barely any material is actually covered, only broad and off-topic discussions. Lots of "rambling" in a sense. Class was mostly empty. The final was extremely difficult and the average was very low compared to him praising 6C and saying how easy it was vs 6A & B

Professor Geller is a really passionate professor and has a love for physics, but the final exam was really frustrating. He had a full practice exam with none of the same topics as the real exam and didn't provide practice problems for the topics on the test. I studied a lot for the final but ended up putting an emphasis on the wrong things.

Prof Geller is a good professor. A bit disorganized but cares about students. Tests were not organized well and it wasn't super clear what was going to be on the test. CLAS definitely helped

Geller is genuinely a horrible professor. Although you can tell he knows a lot about the topics and wants the students to be interested, his lectures are horrible. All he talks about is conceptual ideas when the exams were all math problems. Basically had to teach myself everything for the midterm and final. Do not take this class with him.

He's great, class was terrible.

Took his class for Physics 6A &C. Such a empathetic professor and very understanding of his students especially in this pandemic. He drops your lowest quiz/ hw & curves hw. I like how the quizzes arent worth majority of your grade. I used to dislike physics but Geller def made me like it a lot more.

Professor Geller seems like a cool guy, very knowledgeable on the class topics, but the class itself is very hard. Reading the textbook is a must, but it's overly complicated and hard to understand. Geller clears things up a little in his lectures, but even then things aren't explained very well. Overall, he's a cool guy, but the class is not fun.

Let me just say how extremely happy I took Geller after Freund. I had no choice since Freund didn't teach 6B in the Winter. &thank god he didn't, I love Geller! I admired Freund and heard how Geller can be "HARD". Not true! He is passionate and easy to listen too so you don't zone out too often in class. An amazing professor!

Geller is a really good lecturer, but you HAVE to go to lecture because he doesn't use slides. His classes were very conceptual and demo heavy (especially compared to Freund) so it can be tough to study with limited practice problems, but if you do sapling and go to lecture you should be fine. I thought his lectures were always really interesting

I got straight A's in Physics 6A and 6B, then ended up with a B- in Geller's physics 6C class. He's not a terrible lecturer, but doesn't do example problems in class, just explains concepts. Definitely wouldn't recommend for 6C if you have a choice. Prepare to spend time in the PSR trying to figure out everything he doesn't explain.

I dont know why he has a bad rep, he was such an amazing professor and really tried to apply physics to the science field. Geller is better than Freund in my opinion, barely scraped by in Freunds when I studied nonstop. For Geller I could study at least 3 days ahead of time and got an A-. I love how Geller teaches, really made physics interesting!

Lectures are mandatory because iClicker, but lectures are very pointless. If he is not ranting about something he is doing a demo. Little to no notes are taken during lecture. Exams are free game and formula sheet given is not helpful whatsoever. It is best to find your own resources and learn from the homework and CLAS

Geller does not teach his students at all. All he does is demos in class, and maybe covers 1 or 2 equations. He should stick to research and let someone who has a passion for teaching do the teaching. There's no clear level of expectations that he has. Be prepared to teach yourself everything, because he won't be the one to teach you.

Geller's lectures were really fun to attend because of the fact that he does a lot of demos and talks about real life applications of the physics. We do a lot of problem solving on Sapling so it's helpful to see why. He uses iClickers but that helps boost your grade. A lot of people don't like his lectures but they're also the ones who don't go.

Lecture is focused on concepts and demonstrations instead of problem solving which isnt for everyone. I personally think its better that way bc the math isnt hard but if you dont understand the concepts you wont know where to start. Read the textbook and do Vinces CLAS problems and its not too hard of a class.

Geller's lectures are pretty interesting but they wont help you pass the tests. Reading the book is a necessity in order to pass. CLAS is also super helpful, as Geller does not do practice problems in class and the tutors help fill in a lot of information he skips over. No curve but his test averages were quite high (78 on mideterm and 72 on final)

To be honest, Geller's lecture is boring, he doesn't talk a lot about problem-solving strategies but a lot of experiments and other stuff. So then you have to really read the textbook and do all the questions from CLAS. he doesn't even have practice exams which would make you feel very nervous before exams. His exams are way easier than homework.

Average was super high. Was hoping to get a B because the class has a historically nice curve but ended up with C+ because there was no curve in the course.

Geller's lectures are absolutely terrible, but you kinda feel the need to go anyway. Out of an entire quarter (TR lectures), he had three day's worth of iClicker. Doesn't teach, just talks about applications and astronomy. Also, he sounds like Bentley from the Sly games. Big oof.

Geller is an average professor. He is really passionate about physics which is great, but his lectures are very conceptual, and he doesn't cover much of the 'practical' stuff. The final only covered the concepts that he discussed in class, so just do problems to familiarize yourself with the equations and you'll be fine.

Lecture is mostly conceptual stuff that wont be test material, but still go for the equations and problems that he wants you to know. Practice hard problems and go to CLAS. Read the book. No curve or very little curve.