I had an initial phone screening with an HR person. A week or so later I was interviewed at a local office. This interview was with 4 different people throughout the morning followed by a writing sample. Soon after they asked me to interview at a different office (which had openings). Had another 4 interviews there with a lunch interview with two consultants. Afterwards they asked me to give a brief presentation of my previous work. Overall a very pleasant experience as everyone was very nice, forthcoming and helpful but it was arduous.