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Educated at Cornell and Johns Hopkins, Dr. Dietz simultaneously earned an M.D., a Masters degree in public health, and a Ph.D. in sociology. He was a psychiatry resident at the Johns Hopkins Hospital and Chief Fellow in Forensic Psychiatry at the University of Pennsylvania. He served as an Assistant Professor of Psychiatry at the Harvard Medical School and as Professor of Behavioral Medicine and Psychiatry and Professor of Law at the University of Virginia. He is now Clinical Professor of Psychiatry and Biobehavioral Sciences at the UCLA School of Medicine.
Dr. Dietz has testified and/or consulted in all 50 states, participating in such notable cases as those involving John Hinckley, Jeffrey Dahmer, Susan Smith, Polly Klaas, the Menendez brothers (retrial), John DuPont, the New York Zodiac, the Prom Mom case, the Unabomber, Jared Loughner, the shootings at the Vera Wang Bridal Salon, Empire State Building, and U.S. Capitol, the DC sniper cases, the school shootings at Columbine and other locations, and workplace violence cases of every description.
He is a forensic psychiatrist for both the FBI's Profiling and Behavioral Assessment Unit and the New York State Police Forensic Sciences Unit. He has authored more than 100 publications. Dr. Dietz's work is often cited in scholarly and popular writings, and he has been the subject of profiles on “60 Minutes II,” the A&E network, and in the New Yorker, the Los Angeles Times, Psychology Today, Biography, and other national publications. He has also consulted on films (“The Bodyguard,” "Copycat," "Kiss the Girls," “Primal Fear,” "Turbulence," and “What Lies Beneath”) and many years of as an advisor to Law and Order, Law and Order: Criminal Intent and Law and Order: Los Angeles.