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Ryan Assaf, PhD, MPH

Assistant Adjunct Professor

Dr. Ryan Assaf's work applies community-engaged practices, social determinants of health frameworks, and epidemiological methods to examine the intersections of infectious diseases, substance use and drug-related overdose, and sexual health among people experiencing homelessness and sexual and gender diverse populations.

Ryan is an Assistant Professor in the Division of Health and Society. He received his PhD in Epidemiology at the University of California, Los Angeles, Fielding School of Public Health where he also received his MPH and earned his BS at the University of California, Irvine. He completed his postdoctoral fellowship at the Benioff Homelessness and Housing Initiative, where his work centered on substance use, treatment, overdose, and harm reduction among people experiencing homelessness. Throughout his postdoctoral fellowship, Ryan presented data from the California Statewide Study of People Experiencing Homelessness at academic conferences, in scientific publications, and through op-eds-- one of which was published in the LA Times.

Prior to joining BHHI, Ryan was an epidemiologist at the Los Angeles LGBT Center. With nearly a decade of community- and academic-focused service, he continually worked for organizations that promote advocacy and provide services and protections for marginalized populations, including sexual and gender diverse groups, individuals who use substances, and people experiencing homelessness.

Education
Postdoctoral research fellowship, 08/2024 - , University of California, San Francisco
PhD, 06/2022 - Epidemiology, University of California, Los Angeles
MPH, 03/2019 - Epidemiology, University of California, Los Angeles
BS, 12/2016 - Public Health Science, University of California, Irvine
Publications
  1. McDonell C, Assaf R, McKinney J, Glidden D, Luetkemeyer A, Ayala B, Chan J, Price JC, Morris MD. Assessment of RNA at SVR4 and Treatment Completion as Alternative Measures of Hepatitis C Cure for People Who Inject Drugs. Open forum infectious diseases 2025. PMID: 41477535


  2. Hawes MR, Assaf RD, Birkmeyer JA, Philbin MM, Vijayaraghavan M, Kushel M. Tobacco Use Patterns and Missed Opportunities for Cessation Treatment Among People Experiencing Homelessness. Journal of general internal medicine 2025. PMID: 40562886


  3. Wesson P, Graham-Squire D, Perry E, Assaf RD, Kushel M. Novel methods to construct a representative sample for surveying California's unhoused population: the California Statewide Study of People Experiencing Homelessness. American journal of epidemiology 2024. PMID: 39267209


  4. Fields JD, Assaf RD, Nguyen KH, Platamone CC, Pottebaum JM, Giannola J, Kushel MB. Health Care Access and Use Among Adults Experiencing Homelessness. JAMA health forum 2025. PMID: 40408090


  5. Assaf RD, Morris MD, Straus ER, Martinez P, Philbin MM, Kushel M. Illicit Substance Use and Treatment Access Among Adults Experiencing Homelessness. JAMA 2025. PMID: 39969877


  6. Assaf RR, Assaf RD, Padlipsky PS, Young KDA. A family-centered approach to social needs awareness in the pediatric emergency department. Volume 4. PEC Innovation 2024. PMID: 38689830


  7. Assaf RD, Hamad R, Javanbakht M, Arah OA, Shoptaw SJ, Cooper ZD, Gorbach PM. Associations of U.S. state-level COVID-19 policies intensity with cannabis sharing behaviors in 2020. Volume 21 of Issue 1. Harm reduction journal 2024. PMID: 38622670


  8. Assaf RR, Assaf RD, Doucet HB, Graff D. Social Care Education and Training Among US Pediatric Emergency Medicine Fellowship Programs. Volume 40 of Issue 8. Pediatric emergency care 2024. PMID: 38563810


  9. Jauregui JC, Hong C, Assaf RD, Cunningham NJ, Krueger EA, Flynn R, Holloway IW. Examining Factors Associated with Cannabis Use Among Sexual and Gender Minority and Cisgender Heterosexual Emerging Adults in California. Volume 11 of Issue 5. LGBT health 2024. PMID: 38301143


  10. Reid SC, Wang V, Assaf RD, Kaloper S, Murray AT, Shoptaw S, Gorbach P, Cassels S. Novel Location-Based Survey Using Cognitive Interviews to Assess Geographic Networks and Hotspots of Sex and Drug Use: Implementation and Validation Study. Volume 7. JMIR formative research 2023. PMID: 37347520


  11. Assaf RD, Javanbakht M, Gorbach PM, Cooper ZD. Cannabis Use and Sharing Practices Among Sexual Minority and Heterosexual Individuals During the COVID-19 Pandemic. Volume 10 of Issue 7. LGBT health 2023. PMID: 37252794


  12. Assaf RD, Javanbakht M, Gorbach PM, Arah OA, Shoptaw SJ, Cooper ZD. Puff, Puff, Don't Pass: harm reduction for cannabis use during a viral respiratory pandemic. Volume 20 of Issue 1. Harm reduction journal 2023. PMID: 36829150


  13. Assaf RR, Assaf RD, Barber Doucet H, Graff D. Pediatric emergency department organization and social care practices among U.S. fellowship programs. Volume 6 of Issue 4. AEM education and training 2022. PMID: 35982713


  14. Jann JT, Cunningham NJ, Assaf RD, Krysiak RC, Herman D. Evolving Primary Care Utilization of Transgender and Gender-Nonconforming People at a Community Sexual Health Clinic. Volume 7 of Issue 4. Transgender Health 2022. PMID: 36033210


  15. Lake S, Assaf RD, Gorbach PM, Cooper ZD. Changes in secondary substance use after the onset of the COVID-19 pandemic among people who use cannabis: Findings from a web-based sample of adults in the United States. Volume 31 of Issue 2. Experimental and clinical psychopharmacology 2022. PMID: 35467920


  16. Assaf RR, Barber Doucet H, Assaf RD, Graff D. Social care practices and perspectives among U.S. pediatric emergency medicine fellowship programs. Volume 6 of Issue 2. AEM education and training 2022. PMID: 35493290


  17. Assaf RD, Cunningham NJ, Adamson PC, Jann JT, Bolan RK. High proportions of rectal and pharyngeal chlamydia and gonorrhoea cases among cisgender men are missed using current CDC screening recommendations. Volume 98 of Issue 8. Sexually transmitted infections 2022. PMID: 35217590


  18. Assaf RD, Gorbach PM, Cooper ZD. Changes in medical and non-medical cannabis use among United States adults before and during the COVID-19 pandemic. Volume 48 of Issue 3. The American journal of drug and alcohol abuse 2022. PMID: 35130464


  19. Lake S, Assaf RD, Gorbach PM, Cooper ZD. Selective Changes in Medical Cannabis Use Early in the COVID-19 Pandemic: Findings from a Web-Based Sample of Adults in the United States. Volume 8 of Issue 1. Cannabis and cannabinoid research 2022. PMID: 35073161


  20. Assaf RD, Konda KA, Torres TS, Vega-Ramirez EH, Elorreaga OA, Diaz-Sosa D, Diaz SD, Pimenta C, Robles R, Medina-Mora ME, Grinsztejn B, Caceres C, Veloso VG. Are men who have sex with men at higher risk for HIV in Latin America more aware of PrEP? Volume 16 of Issue 8. PloS one 2021. PMID: 34388155


  21. Jann JT, Cunningham NJ, Assaf RD, Bolan RK. Evidence supporting the standardisation of extragenital gonorrhoea and chlamydia screenings for women. Volume 97 of Issue 8. Sexually transmitted infections 2020. PMID: 33361465


  22. Assaf RD, Javanbakht M, Meites E, Gratzer B, Steinau M, Crosby RA, Markowitz LE, Unger ER, Gorbach PM. Sexual Mixing Patterns and Anal Human Papillomavirus Among Young Gay, Bisexual, and Other Men Who Have Sex With Men and Transgender Women in 2 Cities in the United States, 2012-2014. Volume 47 of Issue 7. Sexually transmitted diseases 2020. PMID: 32541306


  23. Daniels J, Lane T, Maleke K, Mogos W, Assaf R, Struthers H, McIntyre J, Coates T. Exploring dual disclosures for men who have sex with men in Mpumalanga, South Africa: a report from the field. Volume 17 of Issue 1. African journal of AIDS research : AJAR 2018. PMID: 29471726


  24. Chon AH, Korst LM, Assaf RD, Llanes A, Ouzounian JG, Chmait RH. Midtrimester isolated oligohydramnios in monochorionic diamniotic multiple gestations. Volume 32 of Issue 4. The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians 2017. PMID: 28965437


  25. Chon AH, de Oliveira GH, Lemley KV, Korst LM, Assaf RD, Chmait RH. Fetal Serum β2-Microglobulin and Postnatal Renal Function in Lower Urinary Tract Obstruction Treated with Vesicoamniotic Shunt. Volume 42 of Issue 1. Fetal diagnosis and therapy 2016. PMID: 27603215


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