Roy Hazelwood was one of the original profilers at the Behavioral Science Unit when it was first developed at Quantico. He served with the FBI for twenty-two years, taught courses at the Academy, the University of Virginia, the University of Pennsylvania, the U. S. Military Police CID, and Southern Police Institute. As well he was a board-certified forensic examiner and commentator who appeared as an expert on criminal investigations on numerous radio and television shows.