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Carl Latkin, Ph.D., is a Professor at Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior & Society. His work has focused on the social and physical context and well being of drug users and other marginalized populations and developing intervention to enhance the role of drug users' in community-based health promotion.
Sam Friedman, Ph.D. sociologist, is a Senior Research Fellow at the National Development and Research Institutes, Inc. (New York, USA) and the Director of the Interdisciplinary Theoretical Synthesis Core at the Center for Drug Use and HIV Research. Dr Friedman is an author of more than 400 publications on HIV, STI, and drug use epidemiology and prevention. He has both studied drug users organizations since 1985 and has also worked closely with drug user activists in their efforts to fight HIV/AIDS, hepatitis C, and other medical and social harms that drug users encounter.