1st round was on campus and consisted of two back to back 45 minute interviews. 15 min was fit 30 min was a case. Both cases were relatively qualitative and the math was very simple. 2nd round occurred a week later in the office I requested. Same format, two 45 min interviews. Cases were a little more vague, but still very qualitative. After a received an offer, I got flown out to spend a weekend with the office with a bunch of free meals and activities. They definitely sell themselves well.