I first had a phone interview that lasted about an hour. The first forty minutes or so were dedicated to a pretty easy case study, and the last 15-20 to some generic behavioral questions and why I was interested in the company. They got back to me within the day about coming into the office for an in-person interview. At the office, I met with 4 people. In the first portion of the interview, I had to write a mock letter. Next was two standard case studies, neither of which were terribly hard, and finally, a behavior interview.