Park Dietz

Park Dietz

Forensic Psychiatry

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Biography

Park Dietz, MD, MPH, PhD, is a forensic psychiatrist based in Irvine, CA. He holds an M.D., Ph.D., and M.P.H. from Johns Hopkins University. He did his general psychiatry residency at Johns Hopkins and a forensic psychiatry fellowship at the University of Pennsylvania. Early in his career he was Assistant Professor of Psychiatry at Harvard Medical School, and then Professor at the University of Virginia, holding joint appointments at UVA's School of Law and School of Medicine. He is currently Clinical Professor of Psychiatry and Biobehavioral Sciences at the UCLA David Geffen School of Medicine, and consults as a forensic psychiatrist to the FBI's Behavioral Analysis Unit and the New York State Police Forensic Sciences Unit. Dietz founded Threat Assessment Group, Inc. in 1987 (workplace-violence prevention consulting) and Park Dietz & Associates, Inc. He is a past president of the American Academy of Psychiatry and the Law and has authored more than 100 publications. He has testified in high-profile criminal cases, including the trials of John Hinckley Jr. (1982, for the prosecution), Jeffrey Dahmer, and Andrea Yates (2002), and has consulted in matters involving Ted Kaczynski and Jared Lee Loughner. He received the American Academy of Psychiatry and the Law's Seymour Pollack Award in 2010 and was named among Security magazine's "Top 25 Most Influential People in the Security Industry" (2009).

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Profile last updated: October 21, 2026

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