Intensive full day interview at headquarters in Allentown, PA. Had a few interviews in the morning, then had an individual test then a group test, then the afternoon held the rest of the interviews. The interview itself was just one day, then a few weeks later I got my offer

One phone screening followed by an in-person interview. It lasted about 4 hours total and involved presenting my PhD research, followed by questions. Then pairs of interviewers met with me to ask questions. This occurred for three 30-minute sessions.