Incredible professor! I have taken quite a few classes in the statistics department and I have never had such a great professor (not just in the stat department, but also at columbia in general).
He is so dedicated to teaching the class and each of student individually. He clearly puts so much time into preparing for each lecture, and is also extremely helpful when it comes to answering questions. He is very helpful during his office hours and is also open to making time outside his office hours to meet with students.
The statistics department could really use more professors like this one!