I've had one semester of CC with him and he is up and away the best instructor I've had at columbia (granted that's only been a year and a half at this point). Infectiously nice and actually made me want to go to class, and read the material, but you can totally get by in the class without doing so. Specifically wants you to understand the discussion in class on tests (midterm/final) more than random quotations from the reading. Makes sure everyone gets a chance to participate and really wants you to be interested in the material. He may look like a little bit of a straight-edge kinda guy, but he's really willing to work with you if you can't make a deadline/have any sort of issue in the class.