Ben Martin will probably be the best teacher I will ever have at Columbia. As the other review states he is only a graduate student, but he knows how to run a class. He lectures for 5 minutes at the beginning of each class about the life of each author, but that is the longest you will ever hear him speak consecutively in class. His questions are very well formulated and he strongly encourages student participation. The discussions are incredibly enlightening and thought-provoking, (I was especially lucky to have a fairly opinionated and diverse group of talkative classmates). My favorite aspect of Mr. Martin's teaching was that he never brought his personal opinion into the classroom.
His grading can be harsh -- he is a former Chicago University student. His assignments are challenging yet have really improved the way I think critically. I strongly recommend taking CC with him if you can, you will not regret it.