Gregg O. McCrary (born September 10, 1945) is a former FBI agent who served from 1969 to 1995, an expert witness and consultant,[1] 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.[2]
In 2003, he published The Unknown Darkness, a book detailing those cases which he found most important. During his tenure with the FBI, McCrary was a criminal profiler and threat analyst in Quantico, Virginia. He was a member of the "Criminal Investigative Analysis" subunit of the National Center for the Analysis of Violent Crime (NCAVC),[3] serving the center from its foundation in 1985.[2] Since retiring from the FBI, McCrary has served as an expert witness.[4]
British author Colin Wilson dedicated his 1990 book The Serial Killers to Agent McCrary.[2]