Dr Rayner Tan’s research interests revolve broadly about the social determinants of health, community engagement, implementation science, and health equity of vulnerable communities. To date, he has published widely in leading scientific journals, including The Lancet, The Lancet Global Health, Clinical Infectious Diseases, JAMA Network Open, International Journal of Drug Policy, and the Journal of the International AIDS Society.

Rayner was a recipient of the Fulbright Visiting Research Scholarship for the academic year 2022/2023 and has received training in implementation sciences as a fellow of the HIGH-IRI program at Washington University in St. Louis. He is currently deputy editor of a leading HIV scientific journal, the Journal of the International AIDS Society, an Academic Editor at PLOS Global Public Health, and a perspectives editor at the BMJ journal, Sexually Transmitted Infections (STI).

He leads several community-based organizations in the region as well. He currently is the president of Project X Society serving the health and social needs of sex workers, and a Director at The Greenhouse Community Services Limited, a charity providing substance use recovery services for marginalized groups in Singapore. He also currently serves as the Treasurer for the Society of Behavioural Health, Singapore and a co-lead at SG Mental Health Matters. He is currently a co-lead of Project Hayat, a community-led initiative to develop a national suicide prevention strategy in Singapore. He is currently a representative on the Ministry of Health Agency for Care Effectiveness (ACE) Consumer Panel.