Tel (65) 8753 3823
Email siyan@nus.edu.sg

Dr. Yi’s passion for global health research and policy in low- and middle-income countries stems from a deep commitment to improving the health and well-being of vulnerable populations. His work focuses on translating rigorous epidemiologic and implementation research into practical strategies that strengthen health systems and inform policy. Collaborating closely with communities and Ministries of Health across Southeast Asia, he has seen how context-specific, evidence-based interventions can transform health outcomes in resource-limited settings. He is particularly inspired by the potential of implementation research to bridge the gap between knowledge and practice, and remains dedicated to advancing sustainable, equitable health policies that ensure effective interventions reach those who need them most.

• Associate Professor, NUS Saw Swee Hock School of Public Health
• Director, KHANA for Population Health Research
• Technical Advisor, Ministry of Health, Cambodia
• Advisory Board Member, National Council of Science, Technology, & Innovation, Cambodia
• Adjunct Professor, Center for Global Health Research, Touro University California, United States

• Implementation research and epidemiology
• Infectious diseases (HIV/AIDS, tuberculosis, infection prevention and control)
• Sexual reproductive health and rights
• Mental health
• Maternal and child health

• Epidemiology
• Public health program design, implementation, and evaluation
• Community and global health
• Grant proposal and scientific writing

• PhD in Community and Global Health, School of International Health, University of Tokyo, Japan (2010)
• MHSc in International Health, School of International Health, University of Tokyo, Japan (2007)
• MD, University of Health Sciences, Cambodia (2001)

• Outstanding Cambodian Scientist Award (Gold), Ministry of Industry, Science, Technology, & Innovation, Royal Government of Cambodia, 2025
• Gold Medal, National Institute of Public Health, Ministry of Health, Royal Government of Cambodia, 2025
• National Monysaraphorn Medal, Thipdin Class, Royal Government of Cambodia, 2024
• Public Health Global Hero Award, Touro University California, USA, 2023
• Outstanding Researcher in Infectious Diseases, International Foundation, 2022
• Best Scientific Research Award, Public Health Association of Greater Mekong Sub-Regional Countries, 2019
• Best Investigator Award (Gold), Asia Pacific Academic Consortium for Public Health, 2016
• Best Scientific Research Award (Gold), Public Health Association of Greater Mekong Sub-Regional Countries, 2015

• 2024 – Present: Associate Professor, Saw Swee Hock School of Public Health, NUS
• 2019 – 2023: Assistant Professor, Saw Swee Hock School of Public Health, NUS
• 2018 – 2019: Senior Research Fellow, Saw Swee Hock School of Public Health, NUS
• 2015 – Present: Director, KHANA Center for Population Health Research, Cambodia
• 2014 – Present: Adjunct Professor, Center for Global Health Research, Touro University California, United States
• 2011 – 2014: Research Fellow, Walter H. Shorenstein Asia-Pacific Research Center, Freeman Spogli Institute for International Studies, Stanford University, United States
• 2014 – 2015: Research Fellow, School of Population Health, University of South Australia, Australia
• 2010 – 2011: Research Fellow, Department of Epidemiology and International Health, National Center for Global Health and Medicine, Japan

• NUS Cambodia Program Lead
• Director, KHANA Center for Population Health Research

• World Health Organization/Western Pacific Regional Office (WHO/WPRO)
• United Nations Population Fund (UNFPA)
• Joint United Nations Program on HIV/AIDS (UNAIDS)
• Stop TB Partnership
• National Social Protection Council, Ministry of Economics and Finance, Cambodia
• Ministry of Health, Cambodia

• Tian Z, Chhoun P, Tuot S, Yam LYE, Nagashima-Hayashi M, Zahari M, et al. Impact of a community-based antiretroviral therapy delivery model for people living with HIV in Cambodia. Nat Commun 2025. (In Press).
• Long J, Zhang S, Chu L, Balkian J, Giovannucci I, Mui C, et al. Policies, resource allocation, and interventions for child and adolescent mental health in low- and middle-income countries in the Western Pacific Region: a scoping review. Lancet Reg Health West Pac. 2025:62:101674.
• Yam ELY, Chhoun P, Tian Z, Nagashima-Hayashi M, Zahari M, Tuot S, et al. Cost-effectiveness analysis of a community-based model for delivery of antiretroviral therapy among stable people living with HIV in Cambodia. J Int AIDS Soc. 2025 Jul;28 Suppl 3(Suppl 3):e26476.
• Saravanos G, Teo AKJ, Yam ELY, Chou SC, Chanlivong N, Chanthorn P, et al. Immunisation health workforce capacity building in Southeast Asia: reflections from training programme implementation in Cambodia and Lao PDR. BMJ Glob Health. 2025 Feb 19;10(2):e018007.
• Knop MR, Nagashima-Hayashi M, Lin R, Saing CH, Ung M, Oy S, Yam ELY, Zahari M, Yi S. Impact of mHealth interventions on maternal, newborn, and child health from conception to 24 months postpartum in low- and middle-income countries: a systematic review. BMC Med. 2024;22(1):196.
• Coussens AK, Zaidi SMA, Allwood BW, Dewan PK, Gray G, Kohli M, et al. Classification of early tuberculosis states to guide research for improved care and prevention: an international Delphi consensus exercise. Lancet Respir Med. 2024: S2213-2600 (24)00028-6.
• Saing CH, Ung M, Suy S, Oy S, Dary C, Yam ELY, et al. i-MoMCARE – Innovative Mobile Technology for Maternal and Child Health Care in Cambodia: study protocol of a cluster randomized controlled trial. Trials. 2023; 24(1):692.
• Teo AKJ, Morishita F, Islam T, Viney K, Ong CWM, Kato S, et al. Tuberculosis in older adults: challenges and best practices in the Western Pacific Region. Lancet Reg Health West Pac. 2023;36:100770.
• Kikuchi K, Tuot S, Yasuoka J, Murayama M, Huot C, Yi S. Impact of oral intervention on the oral and overall health of children living with HIV in Cambodia: a randomized controlled trial. BMC Med. 2023;21(1):162.
• Teo AKJ, Morishita F, Prem K, Eng S, An Y, Yi S. Where are the missing people affected by tuberculosis? A program review of patient-pathway and cascade of care to optimize tuberculosis case-finding, treatment, and prevention in Cambodia. BMJ Global Health. 2023;8(3):e010994.

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