Thomas L. Patterson, PhD Professor of Psychiatry University of California, San Diego Dr. Patterson is Professor of Psychiatry at the University of California, San Diego, and has been conducting psychosocial research with HIV-positive and at-risk populations since 1989. He was one of the first researchers to design and test interventions for HIV prevention with HIV-positive persons. He is currently the principal investigator of two San Diego-based, NIH-funded behavioural intervention studies focusing on reducing sexual HIV risk among methamphetamine users. Dr. Patterson also recently completed a major multi-city intervention study with female sex workers that demonstrated the efficacy of a single-session HIV-prevention intervention with this population in several Mexican cities along the US border. Dr. Patterson is the author of the UCSD Performance-based Skills Assessment (UPSA), which was chosen in 2006 by the NIMH MATRICS initiative as the standard measure of functional capacity for clinical trials in schizophrenia. He has published more than 400 articles and book chapters, was a founding editor of AIDS and Behavior, and has served on a number of scientific review panels for NIH and other agencies.