I had Penneys for 33A (not H) this past quarter. He was an expert in linear algebra and it was part of his own research, so he definitely took the course to another level in terms of his expectations (heavily focused on proofs and deeper understanding rather than easy computations). It was very difficult to keep up with him in lecture but we got used to it and the key was reviewing the notes after class and trying to understand everything he talked about. His exams were pretty fair in my opinion, and I got in A in the class, which I'm pretty proud of considering the level that he expected from us. Overall a good prof.