Greg O. McCrary is a former FBI agent, an author and an adjunct forensic psychology professor at Nova Southeastern University in Fort Lauderdale, and at Marymount University in Arlington, Virginia. McCrary was a contributing author to the 1992 Crime Classification Manual.[1] In 2003, he published The Unknown Darkness and Us, a book detailing those cases which he found most important. During his tenure with the FBI, McCrary was a criminal profiler and threat analyist in Quantico, Virginia. He was a member of the "Criminal Investigative Analysis" subunit of the National Center for the Analysis of Violent Crime (NCAVC),[2] serving the Center from its foundation in 1985.[1] Since retiring from the FBI, McCrary has served as an expert witness.[3]
British author Colin Wilson dedicated his 1990 book The Serial Killers to Agent McCrary.[1]