Met with company reps at a career fair in D.C. I have experience working in energy, so they were more than happy to give me a quick on-site interview. About 2 weeks later they invited me out for a 2 day interview which consisted of about 3 quantitative case interviews and several opportunities to meet with staff (both junior and senior). Not going to lie, the interview process is extremely challenging. With that said, this is an excellent company that deserves the best and brightest out there (hence the hard interview process).