Last updated on: 12/15/2008 | Author:

Ray Blanchard, PhD Biography

Professor of Psychiatry at the University of Toronto
Pro to the question "Is Sexual Orientation Determined at Birth?"

“The finding that a man’s sexual orientation relates to his number of older brothers is based entirely on epidemiological rather than experimental data. The evidence for this relation arises from events in prenatal life rather than experiences in childhood or adolescence is scanty but consistent.”

“Quantitative and Theoretical Analyses of the Relation Between Older Brothers and Homosexuality in Men,” Journal of Theoretical Biology , 2004

Involvement and Affiliations:
  • Professor of Psychiatry, University of Toronto
  • Head, Clinical Sexology Services, Centre for Addiction and Mental Health, 1995 – present
  • Senior Scientist, Clinical Research Department, Centre for Addiction and Mental Health
  • Member, Sexual and Gender Identity Disorders Work Group, Fifth Edition of the Diagnostic and Statistical Manual of Mental Disorders
  • Associate Editor, Sexual Abuse: A Journal of Research and Treatment
  • Member, Editorial Board, Archives of Sexual Behavior.
  • Former Researcher, Gender Identity Clinic, Clarke Institute of Psychiatry (now part of the CAMH) , 1980-1995
  • Former President, International Academy of Sex Research
  • Former Clinical Psychologist, Ontario Correctional Institute
  • Former Fellow, Killam Postdoctoral Fellowship, Dalhousie University, 1973-1976
  • PhD, Psychology, University of Illinois, 1973
  • AB, Psychology, University of Pennsylvania, 1967
  • None found
Quoted in:
  1. Does the Fraternal Birth Order Effect Demonstrate a Biological Basis to Sexual Orientation?