Samuel R. Friedman, PhD, is Director of the Institute for Infectious Disease 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. Dr. Friedman is an author of about 450 publications on HIV, STI, and drug use epidemiology and prevention, including pieces in Nature, Science, Scientific American, the New England Journal of Medicine, JAMA, the American Journal of Epidemiology, and the American Journal of Public Health. Recent research projects have included 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; a study of socioeconomic and policy predictors of the extent of injection drug use, of HIV epidemics, and of HIV prevention efforts in US metropolitan areas; a longitudinal study of how the HIV epidemics and related programs among people who inject drugs, men who have sex with men, and heterosexuals in US metropolitan areas are associated with each other; and the development of novel measures to understand how structural interventions or Big Events/Complex Emergencies affect variables related to HIV risk networks and behaviors. Honors include the International Rolleston Award of the International Harm Reduction Association (2009), the first Sociology AIDS Network Award for Career Contributions to the Sociology of HIV/AIDS (2007), a Lifetime Contribution Award, Association of Black Sociologists (2005), and a NIDA Avant Garde Award for research on Preventing HIV Transmission by Recently-Infected Drug Users.