Math 115A is the UCLA introductory course in proof-based mathematics. This class is a very well thought out introduction of a simple topic, with rigorous proofs of mathematical theorems.

Professor Heilman is an organized and engaging teacher, as far as math professors go at UCLA. All of the lecture notes will be provided before the first day of class, so students can keep up with where lecture material is going. The homework is also posted well in advance of its due date. All lecture material is carefully explained and paced during the quarter.

In office-hours, Professor Heilman is always willing to walk through class notes and homework problems. He'll even give advice outside of lecture material about further study in mathematics, such as graduate school and research opportunities.

It's very clear that Professor Heilman is concerned with his student and a phenomenal teacher. I would highly recommend taking any upper division math class with him.