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Ronald Keith Siegel (b. 1943) is an associate research professor in the Department of Psychiatry and Biobehavioral Sciences at UCLA, and the author of several noted studies and books on psychopharmacology, hallucination, and paranoia.[1] Siegel has studied, lectured, and conducted research at Brandeis University, Harvard Medical School, Dalhousie University, and the Albert Einstein College of Medicine, and has been a consultant to several government commissions on drug use. His research has focused on the effects of drugs on human behavior, and has included numerous clinical studies in which human volunteers have taken drugs such as ketamine, LSD, marijuana, mescaline, psilocybin, and THC.[2]


  1. Of Fire in the Brain, Oliver Sacks wrote: "there is no one around who knows more about hallucinations than Ronald K. Siegel [...] an intensely interesting and worthwhile book -- I know of no other quite like it."


  • Intoxication: The Universal Drive for Mind-Altering Substances (2005, 1989)
  • Whispers: The Voices of Paranoia (1994)
  • Fire in the Brain: Clinical Tales of Hallucination (1992)
  • Hallucinations: Behavior, Experience, and Theory (with L.J. West) (1975)
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