First round was in our campus career center. Met with a Principal and spoke with her for about 30 minutes. Came back for a second round in the SF office a couple weeks later and had three 45 minute interviews, all very conversational. A handful of moderate difficulty questions, but very relaxed for the most part. We also had a case study, which essentially is your way of demonstrating your learning style, as well as your quantitative reasoning and critical thinking skills. Overall, great people and a highly enjoyable day! Everyone is wonderful, really kind and welcoming.