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Gregory Leong, MD

Clinical Professor Psychiatry & The Behavioral Sciences (Part-Time)

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Phone +1 323 442 4003
Email gleong@usc.edu
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Overview

Gregory Leong, M.D. served as a faculty member of the Department of Psychiatry and Behavioral Sciences at the University of Southern California from 1982 to 1986 before returning to the Department in 2012. During the intervening years, he has been on the medical school faculties at the University of California, Los Angeles, University of Missouri, Ohio State University, and University of Washington. While at the University of Washington Dr. Leong was the Director of the Forensic Psychiatry Fellowship from 2008 to 2011.

Dr. Leong’s academic interests have primarily revolved around forensic psychiatry. While at the University of California, Los Angeles, he participated in research projects involving schizophrenia, post-traumatic stress disorder, and smoking cessation.

On the national level, Dr. Leong has served on the Executive Council of the American Academy of Psychiatry and the Law from 1997 to 2000, the Council of Psychiatry and Law of the American Psychiatric Association from 2002 to 2007, and the Committee on Recertification in Forensic Psychiatry of the American Board of Psychiatry and Neurology from 2000 to 2003.

Besides authoring or co-authoring numerous scholarly publications in the professional literature, Dr. Leong served as an associate editor of the Newsletter of the American Academy of Psychiatry and the Law from 1992 to 1999 and an associate editor of the Journal of the American Academy of Psychiatry and the Law from 2004 to 2009. Dr. Leong has been on the editorial board of Behavioral Sciences and the Law since 2017. Dr. Leong received the Golden Apple (AAPL) Award from the American Academy of Psychiatry and the Law (AAPL) in 2019 (in recognition of having made significant contributions to the field of forensic psychiatry).

Publications

  • Underfunding of Psychiatric Services for the Civilly and Criminally Committed J Am Acad Psychiatry Law. 2022 12; 50(4):541-544. . View in PubMed
  • Voluntary intoxication, homicide, and mens rea: Past, present, and future Behav Sci Law. 2021 Apr; 39(2):150-169. . View in PubMed
  • Insane Arsonists: An Early 21st Century Sample J Forensic Sci. 2019 Mar; 64(2):454-459. . View in PubMed
  • The Ever-Evolving Duty to Protect in California J Am Acad Psychiatry Law. 2015 Jun; 43(2):262. . View in PubMed
  • Determining a Criminal Defendant’s Competency to Proceed With an Extradition Hearing J Am Acad Psychiatry Law. 2015 Jun; 43(2):201-9. . View in PubMed
  • Informed Consent at Gunpoint: When Psychiatry Affects Gun Ownership Behav Sci Law. 2015 Jun; 33(2-3):346-55. . View in PubMed
  • No duty to warn in California: now unambiguously solely a duty to protect J Am Acad Psychiatry Law. 2014; 42(1):101-8. . View in PubMed
  • No duty to warn in California: now solely and unambiguously a duty to protect J Am Acad Psychiatry Law. 2014; 42(4):533. . View in PubMed
  • Commentary: Pursuing justice in death penalty trials J Am Acad Psychiatry Law. 2012; 40(1):50-4. . View in PubMed
  • Psychiatric ethics: foundational and evolutionary J Nerv Ment Dis. 2011 Aug; 199(8):562-6. . View in PubMed
  • Competence to be executed: An ethical analysis post Panetti Behav Sci Law. 2010 Sep-Oct; 28(5):690-706. . View in PubMed
  • The slayer statute and insanity J Am Acad Psychiatry Law. 2010; 38(2):258-62. . View in PubMed
  • Toward revising the ethical boundaries of research with noncompetent subjects Am J Psychiatry. 2009 Feb; 166(2):131-4. . View in PubMed
  • Revisiting the deific-decree doctrine in Washington state J Am Acad Psychiatry Law. 2008; 36(1):95-104. . View in PubMed
  • Revisiting the politics of dangerousness J Am Acad Psychiatry Law. 2008; 36(3):278-81. . View in PubMed
  • Commentary: restorability of incompetence to stand trial–implications beyond predictive equations J Am Acad Psychiatry Law. 2007; 35(1):44-6. . View in PubMed
  • Commentary: intoxication and settled insanity–unsettled matters J Am Acad Psychiatry Law. 2007; 35(2):183-7. . View in PubMed
  • Regarding delusional misidentification syndromes Psychiatry (Edgmont). 2006 Dec; 3(12):10. . View in PubMed
  • Back to the past in California: a temporary retreat to a Tarasoff duty to warn J Am Acad Psychiatry Law. 2006; 34(4):523-8. . View in PubMed
  • Lycanthropy and delusional misidentification Acta Psychiatr Scand. 2005 Feb; 111(2):162; author reply 162. . View in PubMed
  • : involuntary treatment case or catalyst for change? J Am Acad Psychiatry Law. 2005; 33(3):292-4.. View in PubMed
  • Commentary: No rational reasons for changing competency-to-stand-trial standard J Am Acad Psychiatry Law. 2004; 32(3):246-9. . View in PubMed
  • A neuropsychiatric developmental model of serial homicidal behavior Behav Sci Law. 2004; 22(6):787-99. . View in PubMed
  • Neuroleptic-induced akathisia and violence: a review J Forensic Sci. 2003 Jan; 48(1):187-9. . View in PubMed
  • A new classification schema for maternal filicide J Am Acad Psychiatry Law. 2003; 31(1):143-4. . View in PubMed
  • Delusional misidentification and aggression in Alzheimer’s disease J Forensic Sci. 2001 May; 46(3):581-5. . View in PubMed
  • A classification of psychological factors leading to violent behavior in posttraumatic stress disorder J Forensic Sci. 2001 Mar; 46(2):309-16. . View in PubMed
  • Potential erosion of psychotherapist-patient privilege beyond California: dangers of “criminalizing” Tarasoff Behav Sci Law. 2001; 19(3):437-49. . View in PubMed
  • Capgras syndrome during the wake and dream state Can J Psychiatry. 2000 Apr; 45(3):299-300. . View in PubMed
  • Evaluation of competence to consent to assisted suicide: views of forensic psychiatrists Am J Psychiatry. 2000 Apr; 157(4):595-600. . View in PubMed
  • A case of partial lycanthropy Can J Psychiatry. 2000 Mar; 45(2):201-2. . View in PubMed
  • Stalking behavior in delusional jealousy J Forensic Sci. 2000 Jan; 45(1):77-82. . View in PubMed
  • A case of Cotard’s syndrome associated with self-starvation J Forensic Sci. 2000 Jan; 45(1):188-90. . View in PubMed
  • Diminished capacity and insanity in Washington State: the battle shifts to admissibility J Am Acad Psychiatry Law. 2000; 28(1):77-81. . View in PubMed
  • Revisiting arson from an outpatient forensic perspective J Forensic Sci. 1999 May; 44(3):558-63. . View in PubMed
  • A test of behavioral family therapy to augment exposure for combat-related posttraumatic stress disorder J Consult Clin Psychol. 1999 Apr; 67(2):243-51. . View in PubMed
  • Dangerous misidentification of people due to flashback phenomena in posttraumatic stress disorder J Forensic Sci. 1998 Nov; 43(6):1107-11. . View in PubMed
  • A comprehensive typology for the biopsychosociocultural evaluation of child-killing behavior J Forensic Sci. 1998 Nov; 43(6):1112-8. . View in PubMed
  • Delusion of sexual transformation as delusional misidentification syndrome Can J Psychiatry. 1998 Nov; 43(9):956-7. . View in PubMed
  • Delusional physical misidentification in the syndrome of subjective doubles Can J Psychiatry. 1998 Apr; 43(3):308. . View in PubMed
  • Erotomania in a case of fragile-X syndrome Gen Hosp Psychiatry. 1998 Mar; 20(2):126-7. . View in PubMed
  • The dangerousness of persons with delusional jealousy J Am Acad Psychiatry Law. 1998; 26(4):607-23. . View in PubMed
  • Violent behaviors associated with the antichrist delusion J Forensic Sci. 1997 Nov; 42(6):1058-61. . View in PubMed
  • The “delirium” of delusional misidentification: implications for the classification of delusional misidentification syndromes Can J Psychiatry. 1997 Aug; 42(6):665. . View in PubMed
  • The role of mania in the genesis of dangerous delusional misidentification J Forensic Sci. 1997 Jul; 42(4):670-4. . View in PubMed
  • A new variant of “subjective” delusional misidentification associated with aggression J Forensic Sci. 1997 May; 42(3):406-10. . View in PubMed
  • The antichrist delusion as a delusional misidentification syndrome of the self Can J Psychiatry. 1997 Feb; 42(1):90. . View in PubMed
  • Disability payments and drug abuse Psychiatr Serv. 1996 Nov; 47(11):1266. . View in PubMed
  • Dangerous delusional misidentification and homicide J Forensic Sci. 1996 Jul; 41(4):641-4. . View in PubMed
  • Syndrome of “reverse” intermetamorphosis Can J Psychiatry. 1996 May; 41(4):260-1. . View in PubMed
  • Civil commitment and managed care Psychiatr Serv. 1996 Apr; 47(4):432. . View in PubMed
  • Employee sabotage in the workplace: a biopsychosocial model J Forensic Sci. 1996 Jan; 41(1):52-5. . View in PubMed
  • Tales of the crypt for psychiatrists: mourning, melancholia, and mortuary malpractice Bull Am Acad Psychiatry Law. 1996; 24(4):483-92. . View in PubMed
  • California’s diminished capacity defense: evolution and transformation Bull Am Acad Psychiatry Law. 1996; 24(3):347-66. . View in PubMed
  • The relation of Cotard’s syndrome to delusional misidentification Isr J Psychiatry Relat Sci. 1996; 33(3):188-93. . View in PubMed
  • Bilateral cerebral pathology and the genesis of delusional misidentification Can J Psychiatry. 1995 Oct; 40(8):498-9. . View in PubMed
  • Psychiatric-legal analysis of criminal defendants charged with murder: a sample without major mental disorder J Forensic Sci. 1995 Sep; 40(5):858-61. . View in PubMed
  • Another courtroom assault on the confidentiality of the psychotherapist-patient relationship J Forensic Sci. 1995 Sep; 40(5):862-4. . View in PubMed
  • Dangerous delusions of misidentification of the self J Forensic Sci. 1995 Jul; 40(4):570-3. . View in PubMed
  • A case of inanimate doubles syndrome Can J Psychiatry. 1995 Jun; 40(5):277. . View in PubMed
  • A psychiatric-legal analysis of psychotic criminal defendants charged with murder J Forensic Sci. 1995 May; 40(3):445-8. . View in PubMed
  • Delusional misidentification of the self associated with nondominant cerebral pathology J Clin Psychiatry. 1995 Apr; 56(4):171. . View in PubMed
  • Studying violent behavior Psychiatr Serv. 1995 Apr; 46(4):408-9. . View in PubMed
  • Visual-perceptual abnormalities in delusional misidentification Can J Psychiatry. 1995 Feb; 40(1):6-8. . View in PubMed
  • Visual-perceptual disturbances in delusional misidentification Isr J Psychiatry Relat Sci. 1995; 32(4):286-90. . View in PubMed
  • Psychiatric factors associated with dangerous misidentification delusions Bull Am Acad Psychiatry Law. 1995; 23(1):53-61. . View in PubMed
  • Delusional misidentification of health care professionals Psychiatr Q. 1995; 66(1):51-61. . View in PubMed
  • Behavioral family therapy for Vietnam combat veterans with posttraumatic stress disorder J Psychother Pract Res. 1995; 4(3):214-23. . View in PubMed
  • The dangerousness of persons with the Othello syndrome J Forensic Sci. 1994 Nov; 39(6):1445-54. . View in PubMed
  • A cognitive model of dangerous delusional misidentification syndromes J Forensic Sci. 1994 Nov; 39(6):1455-67. . View in PubMed
  • Approaches offered for curbing violence in the health-care workplace Tex Med. 1994 Oct; 90(10):7. . View in PubMed
  • Delusional misidentification syndromes may not fall into clearly delineated categories Compr Psychiatry. 1994 May-Jun; 35(3):244. . View in PubMed
  • Behavioural family management in schizophreniaOutcome of a clinic-based intervention. Br J Psychiatry. 1994 Apr; 164(4):501-6. . View in PubMed
  • Co-existence of misidentification, pseudocyesis and erotomanic delusions Can J Psychiatry. 1994 Mar; 39(2):126. . View in PubMed
  • De Clérambault syndrome (erotomania) in the criminal justice system: another look at this recurring problem J Forensic Sci. 1994 Mar; 39(2):378-85. . View in PubMed
  • “Tarasoff” defendants: social justice or ethical decay? J Forensic Sci. 1994 Jan; 39(1):86-93.. View in PubMed
  • Delusions of psychological change of the self Psychopathology. 1994; 27(6):285-90. . View in PubMed
  • Delusional misidentification syndromes and dangerousness Psychopathology. 1994; 27(3-5):215-9. . View in PubMed
  • Silence or death: the limits of confidentiality when a psychotherapist is threatened by the patient J Psychiatry Law. 1994; 22(2):235-44. . View in PubMed
  • Competence to terminate life-sustaining care: ethical and legal considerations Am J Geriatr Psychiatry. 1994; 2(2):95-108. . View in PubMed
  • The psychotic patient as security guard J Forensic Sci. 1993 Nov; 38(6):1436-40. . View in PubMed
  • Delusional misidentification and dangerousness: a neurobiologic hypothesis J Forensic Sci. 1993 Jul; 38(4):904-13. . View in PubMed
  • A case of organic Othello syndrome J Clin Psychiatry. 1993 Jul; 54(7):277. . View in PubMed
  • Syndrome of exchanged doubles Can J Psychiatry. 1993 Jun; 38(5):368. . View in PubMed
  • Misidentification delusions, facial misrecognition, and right brain injury Can J Psychiatry. 1993 May; 38(4):239-41. . View in PubMed
  • Frégoli syndrome of the self Can J Psychiatry. 1993 Feb; 38(1):68. . View in PubMed
  • Delusions of transformation of the self Psychopathology. 1993; 26(3-4):181-8. . View in PubMed
  • Psychiatry and the death penalty: the past decade Psychiatr Ann. 1993 Jan; 23(1):41-7. . View in PubMed
  • Evolving misidentification syndromes and facial recognition deficits Can J Psychiatry. 1992 Oct; 37(8):574-6. . View in PubMed
  • A psychiatric study of persons charged with arson J Forensic Sci. 1992 Sep; 37(5):1319-26. . View in PubMed
  • The psychotherapist as witness for the prosecution: the criminalization of Tarasoff Am J Psychiatry. 1992 Aug; 149(8):1011-5. . View in PubMed
  • Dangerousness of the delusional misidentification of children J Forensic Sci. 1992 May; 37(3):830-8. . View in PubMed
  • A case of Capgras-Fregoli syndrome J Clin Psychiatry. 1992 Feb; 53(2):67-8. . View in PubMed
  • The dangerousness of persons with misidentification syndromes Bull Am Acad Psychiatry Law. 1992; 20(1):77-86. . View in PubMed
  • Misidentification syndrome, facial misrecognition, and dysmorphic symptoms Psychosomatics. 1992; 33(4):471-2. . View in PubMed
  • The death penalty and Bernard Diamond’s approach to forensic psychiatry Bull Am Acad Psychiatry Law. 1992; 20(2):197-210. . View in PubMed
  • The physician as erotomanic object West J Med. 1992 Jan; 156(1):77-8. . View in PubMed
  • The Capgras syndrome in paranoid schizophrenia Psychopathology. 1992; 25(3):147-53. . View in PubMed
  • Legal and ethical issues in electroconvulsive therapy Psychiatr Clin North Am. 1991 Dec; 14(4):1007-20. . View in PubMed
  • Misidentified political figures: an underappreciated danger J Forensic Sci. 1991 Jul; 36(4):1170-8. . View in PubMed
  • A case of “subjective” Frégoli syndrome J Psychiatry Neurosci. 1991 Jul; 16(2):103-5. . View in PubMed
  • The Tarasoff dilemma in criminal court J Forensic Sci. 1991 May; 36(3):728-35. . View in PubMed
  • Posttraumatic stress disorder in burn patients South Med J. 1991 Apr; 84(4):530-1. . View in PubMed
  • Transdermal nicotine and smoking behavior in psychiatric patients Am J Psychiatry. 1991 Mar; 148(3):374-5. . View in PubMed
  • Delusion of fetal duplication in a Capgras patient Can J Psychiatry. 1991 Feb; 36(1):46-7. . View in PubMed
  • Opinions by AAPL forensic psychiatrists on controversial ethical guidelines: a survey Bull Am Acad Psychiatry Law. 1991; 19(3):237-48. . View in PubMed
  • The syndrome of intermetamorphosis Psychopathology. 1991; 24(3):158-65. . View in PubMed
  • Misidentification syndrome and male pseudocyesis Psychosomatics. 1991; 32(2):228-30. . View in PubMed
  • Dangerous mentally disordered criminals: unresolvable societal fear? J Forensic Sci. 1991 Jan; 36(1):210-8.. View in PubMed
  • Patient psychopathology and expressed emotion in schizophrenia Br J Psychiatry. 1990 Dec; 157:877-80. . View in PubMed
  • Psychiatric patients and AIDS: the forensic clinician perspective J Forensic Sci. 1990 May; 35(3):644-52. . View in PubMed
  • Sources of patients’ stress Hosp Community Psychiatry. 1990 Mar; 41(3):332. . View in PubMed
  • An unusual case of Capgras syndrome: the psychiatric ward as a stage Psychiatr J Univ Ott. 1990 Mar; 15(1):44-6. . View in PubMed
  • A classification system for misidentification syndromes Psychopathology. 1990; 23(1):27-32. . View in PubMed
  • Judicial discharge of involuntary patients Psychiatr Q. 1990; 61(2):135-41. . View in PubMed
  • Economic motivation for smoking cessation in chronic psychotic patients Acta Psychiatr Scand. 1989 Dec; 80(6):657-8. . View in PubMed
  • Split body and self: an unusual case of misidentification Can J Psychiatry. 1989 Oct; 34(7):728-30. . View in PubMed
  • Narcolepsy, paranoid psychosis, and analeptic abuse Psychiatr J Univ Ott. 1989 Sep; 14(3):481-3. . View in PubMed
  • Syndrome of intermetamorphosis: a new perspective Compr Psychiatry. 1989 May-Jun; 30(3):209-13. . View in PubMed
  • Factitious AIDS in a psychiatric inpatient Can J Psychiatry. 1989 May; 34(4):320-2. . View in PubMed
  • The expansion of psychiatric participation in social control Hosp Community Psychiatry. 1989 Mar; 40(3):240-2. . View in PubMed
  • Videotape recording of assaultive inpatients Am J Psychiatry. 1989 Feb; 146(2):287-8. . View in PubMed
  • Civil commitment Hosp Community Psychiatry. 1989 Feb; 40(2):192. . View in PubMed
  • Behavioral science and the juvenile death penalty Bull Am Acad Psychiatry Law. 1989; 17(3):301-9. . View in PubMed
  • A case of skin and ear self-mutilation Psychosomatics. 1989; 30(2):228-30. . View in PubMed
  • Capgras syndrome and dangerousness Bull Am Acad Psychiatry Law. 1989; 17(1):5-14. . View in PubMed
  • An HIV-infected psychiatric patient: some clinicolegal dilemmas Bull Am Acad Psychiatry Law. 1989; 17(1):33-43. . View in PubMed
  • Competency issues in referrals Psychosomatics. 1988; 29(1):140-1. . View in PubMed
  • The right to refuse treatment: an uncertain future Psychiatr Q. 1988; 59(4):284-92. . View in PubMed
  • Ethical considerations of clinical use of Miranda-like warnings Psychiatr Q. 1988; 59(4):293-305. . View in PubMed
  • Carbamazepine use in assaultive patients Psychosomatics. 1988; 29(3):367. . View in PubMed
  • Outpatient civil commitment Am J Psychiatry. 1987 May; 144(5):694-6. . View in PubMed
  • Delusion of exchanged doubles in an immigrant: a new Capgras variant? Int J Soc Psychiatry. 1987; 33(4):299-302.. View in PubMed
  • Tarasoff and property damage Am J Psychiatry. 1986 Nov; 143(11):1488. . View in PubMed
  • Serum folate levels in US. psychiatric inpatients. J Clin Psychiatry. 1986 Feb; 47(2):98-9. . View in PubMed

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