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. 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), serving the Center from its foundation in 1985. Since retiring from the FBI, McCrary has served as an expert witness.
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