1964-Present A.O.A. Member since Junior Year of Medical School
1971-Present Fellow, Royal College of Physicians and Surgeons of Canada
1974-1990 Assistant and Associate Examiner, American Board of Psychiatry and Neurology
1975-Present American Psychiatric Association (Fellow, 1985-2005, Distinguished Life Fellow, 2006 - present)
1975-Present American Psychosomatic Society
1975-Present International Neuropsychological Society (Board of Governors, 1988-1995 & President Elect 2005- 2006, Incoming President 2006-2007, President 2007-2008)
1976-Present Association for Behavioral Science and Medical Education (Board of Directors, 1978-1979 & 1984-1986)
1980-Present Psychiatric Research Society
1985-Present West Coast College of Biological Psychiatry (Emeritus, 2004 - present)
1993-Present International AIDS Society
1993-Present Society of Behavioral Medicine
1994-Present Fellow, Collegium Internationale Neuropsychopharmacologicum (CINP)
1996-Present National Academy of Neuropsychology (Fellow, 2009)
1999-Present International Society for NeuroVirology
1999-Present Honorary Advisor, Hong Kong Neuropsychological Association
2002-Present American College of Neuropsychopharmacology
2002-Present Society for Neuroscience
2003-Present American Academy of Neurology
2012-Present American Psychological Association


1998-2003 International Journal of Neuropsychopharmacology
1994-2004 Editor-in-Chief, Journal of the International Neuropsychological Society
1995-2004 Deputy Editor, AIDS and Behavior
1980-2006 Journal of Clinical and Experimental Neuropsychology
1988-2000 The Clinical Neuropsychologist
1989-2000 Behavioural Neurology
1992- Neuropsychology
2007 Journal of NeuroVirology
2015 Cannabis and Cannabinoid Research