Park Dietz, M.D., M.P.H., Ph.D.

Dr. Dietz received a Bachelor's Degree in psychology and biology from the Cornell University College of Arts and Sciences (1970), an M.D. degree from the Johns Hopkins University School of Medicine (1975), a Master’s degree in Public Health from the Johns Hopkins School of Hygiene and Public Health (1975), and a Ph.D. in sociology from the Johns Hopkins University (1984).  He completed his psychiatric residency at the Johns Hopkins Hospital (1975-77) and the Hospital of the University of Pennsylvania (1977-78), where he was Chief Fellow in Forensic Psychiatry.  He has been board certified in psychiatry by the American Board of Psychiatry and Neurology since 1979.  

Currently Clinical Professor of Psychiatry and Biobehavioral Sciences at the UCLA School of Medicine, Dr. Dietz has previously been Professor of Law at the University of Virginia School of Law, Professor of Behavioral Medicine and Psychiatry at the University of Virginia School of Medicine, and Assistant Professor of Psychiatry at Harvard Medical School. 

From 1978 to 1980, Dr. Dietz served as Director of Forensic Psychiatry at Bridgewater State Hospital in Massachusetts and, from 1983 to 1989, was Medical Director of the Forensic Psychiatry Clinic at the University of Virginia’s Institute of Law, Psychiatry and Public Policy.

Dr. Dietz has authored approximately 100 professional publications, mostly on various aspects of criminal and antisocial behavior, including publications regarding forensic mental health assessment, mental defenses, sex offenders, homicide, and serial offenders.

Dr. Dietz has testified as an expert witness in both criminal and civil matters in federal courts throughout the U.S. and the trial courts of nearly every state. A few of the better known cases in which he has been retained are those involving John Hinckley (attempted assassination of President Reagan), Walter Leroy Moody, Jr. (mail bombs killing U.S. Circuit Court Judge Robert Vance of the 11th Circuit Court of Appeals in Birmingham and a civil rights lawyer in Savannah, GA), Jeffrey Dahmer (serial killings in Ohio and Wisconsin), Robert Bardo (murder of actress Rebecca Schaefer), Richard Davis (abduction and murder of Polly Klaas), Arthur Shawcross (serial killings around Rochester New York), Joel Rifkin (serial killings around New York City and Long Island), the retrial of the Menendez brothers (murder of their parents), John DuPont (killing of Olympic wrestler David Schultz), Colin Ferguson (mass murder on the Long Island Railroad), Theodore Kaczynski (the Unabomber), Heriberto Seda (the New York Zodiac serial killer), William Tager (murder of NBC stage hand outside the "Today" show), Charles Ng (serial murders in California), Russell E. Weston (Capitol shootings), Cary Anthony Stayner (murder of three tourists in Yosemite), and John Allen Muhammad and John Lee Malvo (serial sniper murders in the area of Washington, D.C., and elsewhere).

Dr. Dietz is the founder of Threat Assessment Group, Inc. and Park Dietz & Associates, Inc., a forensic litigation consulting firm with experts from a variety of disciplines spanning medicine, the behavioral sciences, and the forensic sciences.  

Click here for more on TAG’s founding.