Two management interviewers who took turns asking questions and taking notes. However, all along they knew who they wanted to hire, so although the interview was professional and went well, the outcome was strange. They soon sent a "thanks for your interest, but..." letter. Then their pre-selected candidate failed the background check and I guess I was top of the heap after that. Once they offered me the job, they immediately did a background check and detailed preemployment physical and I was hired quickly.