Email returned by the vice prez of research, followed by a 45 minute conversation with the same man (it was supposed to be around 20 minutes, we got along swimmingly). I came in for an interview the following week, it was a real marathon.
Met with the vice prez at first, we chatted for about half an hour, he asked me about my college experience (graduating in May), I asked him about the company's style of research/more about their clients. He's a solid guy.
Met with the prez/founder/ceo of the company, we chatted for around 30 minutes as well. Discussed my writing sample in great detail, other research experience, my previous market research experience. I questioned him on his experience with starting a successful company. He's an interesting guy, certainly someone I could see myself working for.
Met with the research team, they grilled me for like an hour and a half. Pretty intense, but none of their questions were especially menacing or difficult to answer. They all seem like reasonable, smart people. Just be casual and most of them will do the same.
Wrapped up with the vice prez as a bit of a cool-down. He broke the news that they weren't actually hiring at the time but might be in the near future, which was frustrating. Overall, a long but decent interview experience that ended in a let-down.