Said this elsewhere, but while I'm at it, I'll say it again:
If anyone has questions about Columbia, shoot me a message, and I'll answer to the best of my ability. I'm in my second year in the philosophy PhD at Columbia and currently serving as one of the grad student reps. My precise areas of interest are hard to pin down, but, roughly speaking, I'm interested the history of philosophy (esp., Kant), normativity, and agency. As a quick, general remark, I've found Columbia to be a wonderful place to study philosophy with a supportive faculty, an active and friendly graduate community, a healthy range of diversity with respect to philosophical interests, and plenty of other great academic resources within and outside of the university.
I'm also a former UW-Milwaukee MA student. So, if you've got questions about that program, I'm happy to throw in my two cents, though, naturally, I'd encourage you to contact current students in the program, too.