Samuel R. Friedman, PhD Senior Research Fellow, Institute for AIDS Research National Development and Research Institutes, Inc. Director, Interdisciplinary Theoretical Synthesis Core Center for Drug Use and HIV Research, New York City Dr. Friedman is a Senior Research Fellow in the Institute for AIDS Research at National Development and Research Institutes, Inc. and the Director of the Interdisciplinary Theoretical Synthesis Core in the Center for Drug Use and HIV Research, New York City. He is also a Senior Research Associate at the Department of Epidemiology, Johns Hopkins University. Recent research projects include: a review of the social research needs of the AIDS field; a study of social factors, social networks and HIV, STI and other blood-borne viruses among youth and drug injectors in a high-risk community; research on the impact of economic and political crises on HIV risk in Buenos Aires; a study of how some long-term drug injectors remain uninfected with HIV and HCV; a study of socioeconomic and policy predictors of the extent of injection drug use, HIV epidemics, and HIV prevention efforts in US metropolitan areas; and research on why women injectors who have sex with women are at enhanced risk for HIV and other infections. Dr. Friedman has authored about 400 publications on HIV, STI, and drug use epidemiology and prevention, including pieces in Nature, Science, Scientific American, New England Journal of Medicine and JAMA. He has engaged in many international collaborative projects with the WHO MultiCentre Study of Drugs and HIV and with researchers in Argentina, Australia, Brazil, and other countries.