Gregg O. McCrary is a former FBI agent, an expert witness and consultant, 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, 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), serving the Center from its foundation in 1985. Since retiring from the FBI, McCrary has served as an expert witness.
- "Gregg O. McCrary". Behavioral Criminology International. Retrieved 20 November 2010.
- Wright, Stuart A. (1995). Armageddon in Waco: critical perspectives on the Branch Davidian conflict. University of Chicago Press. p. 290. ISBN 978-0-226-90845-8.
- Ebisike, Norbert (October 2008). Offender profiling in the courtroom: the use and abuse of expert witness testimony. Greenwood Publishing Group. p. 94. ISBN 978-0-313-36210-1.
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