Robert K. Ressler retired as a supervisory special agent of the FBI as a reserve colonel in the U.S. Army's Criminal Investigation Division (CID). He resides outside of Fredericksburg, Virginia, and is director of Forensic Behavioral Services, a business dedicated to training, learning, consulting, and expert witness testimony.
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Tom Shachtman is also coauthor with Robert Ressler of Justice is Served. He lives in New York City.