Samuel R. Friedman, PhD
CDUHR - Infectious Disease Epidemiology and Theory Core - Associate Director & Senior Theoretician
National Development and Research Institutes, Inc. - Director, Institute for Infectious Disease Research
Johns Hopkins University - Senior Associate, Department of Epidemiology, Bloomberg School of Public Health
PhD, Sociology, University of Michigan
MA, Sociology, University of Michigan
BA, Economics, Harvard University
Research Interests
Transdisciplinary HIV prevention, Networks, HIV, HCV, STIs, Phylogenetics, Metropolitan area cohort studies, Big Events and their sequelae, Recent infection, Prevention for positives, IDUs, MSM, High-risk heterosexuals, Cultural historical activity theory (CHAT), Theoretical and historical overview of the HIV epidemic as a whole
Dr. Friedman has worked on research concerning people who use drugs and HIV since 1983. During this time, he has written widely on related epidemiology and prevention topics. His work has contributed substantially to what we know about drug users’ social networks and their relations to HIV epidemics; to our understanding of macro-social epidemiology of drug use and its associated diseases; to the theory and practice of drug users’ organizations and their efforts to reduce the spread of HIV and other infections among them; to efforts to prevent HIV transmission by drug users and others who have recently become infected; and to our understanding of how HIV and other epidemics among people who used drugs do or do not spread to non-users in their communities.
Principal Investigator, HIV, HCV, STI, OD and Other Risks Associated with Hard Drug Use Among Young Drug Users in St. Petersburg, Russia. Active
Principal Investigator, Metropolitan Trajectories of HIV Epidemics, Drug Use, and Responses in US Key Populations. Active
Principal Investigator, Preventing HIV Transmission by Recently Infected Drug Users. Active
Principal Investigator, Community Vulnerability and Responses to Drug-User-Related HIV/AIDS (CVAR). Completed
Principal Investigator, Developing Measures to Study How Structural Interventions May Affect HIV Risk. Completed
Principal Investigator, Networks, Norms and HIV/STI Risk Among Youth (NNAHRAY). Completed
Principal Investigator, Staying Safe: Long-Term Injection Drug Users Who Avoided HIV & Hepatitis C. Completed


Paraskevis D, Kostaki E, Nikolopoulos GK, Sypsa V, Psichogiou M, Del Amo J, Hodges-Mameletzis I, Paraskeva D, Skoutelis A, Malliori M, Williams L, Friedman SR, Daikos GL, Hatzakis A (2017).
Molecular tracing of the geographical origin of HIV-1 infection and patterns of epidemic spread among migrants who inject drugs in Athens
Clinical Infectious Diseases, 65 (12), 2078-2084. doi: 10.1093/cid/cix717.

Dyer TV, Khan MR, Sandoval M, Acheampong A, Regan R, Bolyard M, Mateu-Gelabert P, Friedman SR (2017).
Drug use and sexual HIV transmission risk among men who have sex with men and women (MSMW), men who have sex with men only (MSMO), and men who have sex with women only (MSWO) and the female partners of MSMW and MSWO: A network perspective
AIDS and Behavior, 21 (12), 3590-3598. doi: 10.1007/s10461-017-1736-3. PMCID: PMC5568510.

Althoff MD, Theall K, Schmidt N, Hembling J, Gebrekristos HT, Thompson MM, Muth SQ, Friedman SR, Kissinger P (2017).
Social support networks and HIV/STI risk behaviors among Latino immigrants in a new receiving environment
AIDS and Behavior, 21 (12), 3607-3617. doi: 10.1007/s10461-017-1849-8. PMCID: PMC5705459.

Skaathun B, Khanna AS, Morgan E, Friedman SR, Schneider JA (2017).
Network viral load: A critical metric for HIV elimination
Journal of Acquired Immune Deficiency Syndromes [Epub 2017 Nov 2]. doi: 10.1097/QAI.0000000000001584.

Jessell L, Mateu-Gelabert P, Guarino H, Vakharia SP, Syckes C, Goodbody, Ruggles KV, Friedman S (2017).
Sexual violence in the context of drug use among young adult opioid users in New York City
Journal of Interpersonal Violence, 32 (19), 2929-2954. doi: 10.1177/0886260515596334. PMCID: PMC4740284.


Friedman SR, West BS, Tempalski B, Morton CM, Cleland CM, Des Jarlais DC, Hall HI, Cooper HL (2014).
Do metropolitan HIV epidemic histories and programs for people who inject drugs and men who have sex with men predict AIDS incidence and mortality among heterosexuals?
Annals of Epidemiology, 24 (4), 304-311. doi: 10.1016/j.annepidem.2014.01.008. PMCID: PMC3954755.

Friedman SR, Sandoval M, Mateu-Gelabert P, Rossi D, Gwadz M, Dombrowski K, Smyrnov P, Vasylyeva T, Pouget ER, Perlman D (2013).
Theory, measurement and hard times: Some issues for HIV/AIDS research
AIDS and Behavior, 17 (6), 1915-1925. doi: 10.1007/s10461-013-0475-3. PMCID: PMC3674169.

Friedman SR, Curtis R, Neaigus A, Jose B, Des Jarlais DC (1999).
Social networks, drug injectors’ lives, and HIV/AIDS.
New York: Plenum.

Dr. Friedman's MyBibliography Profile