Assoc. Prof. JOHN Abisheganaden
Director and Senior Consultant, Health Services & Outcomes Research

Associate Professor John Abisheganaden was appointed Director and Senior Consultant, HSOR on 1st October 2023. He holds a Fellowship from the Royal College of Physicians, Edinburgh UK; a MMED (Internal Medicine) from NUS Singapore, as well as a FAMS (Respiratory Med) from Academy of Medicine Singapore.  He leads the HSOR team in population decision analytics and operations research, implementation and outcomes evaluation, as well as health system performance and sustainability. He is also Chair of NHG Respiratory Health Steering Committee, and an Advisor to the NHG Value-Based Care Workgroup.​

Tel: 6496 6977​

Dr Heng Bee Hoon

MBBS, MSc (Public Health), FAMS
Senior Director

Dr Heng is the founding director of HSOR from 2005.

Tel: 6496 6939


Dr Gary Ang Yee
MBBS, MPH, Dip (Family Med), GDMH, DIP (Family Practice Dermatology)
Consultant (Public Health)

Dr Ang Yee Gary is a public health consultant with research interests in Type 2 diabetes mellitus, diabetic complications as well as the application of technology in healthcare. He is also a reviewer for many journals and was recognized for being Reviewer of the Year for Journal of Diabetes from 2018 to 2021.

Tel: 6496 6928


Eric Chua Siang Seng
BSc (Hons), (Business Management)
Senior Executive

Eric has worked on a variety of corporate events including the Annual Healthcare Humanity Awards, Senior Management Meetings as well as Board Retreats. Prior to joining NHG, he was an experienced Project Management and Marketing Specialist in Multinational Corporations for more than 7 years.

Tel: 6496 6923



Ge Lixia
BMed (Nursing), MSc (Physiology)
Senior Research Analyst

Lixia is currently involved in population health evaluation and quality of care projects. She has been involved in research teams spanning various industries such as healthcare, education and sports science. Prior to joining NHG, she conducted various clinical oncology research at National University of Singapore. Her research interests include community health, nutrition, clinical research and epidemiology.
Tel: 6340 6949


Joey Ha Wei Yee

​BSocSci (Hons) (Economics)

Joey graduated in Economics (Specialisation in Applied and Policy Economics) from NUS. Prior to her employment in NHG-HSOR, Joey was involved in projects evaluating costs and other health-related outcomes for research studies. 
Tel: 6340 2419



Dr Joseph Antonio D Molina
MD, MSc (Public Health)
Head of Implementation & Outcomes

Joseph is a medical doctor with graduate training in epidemiology and public health. He has been involved in training activities, evaluation of health programs and services, as well as health technology assessments. He concurrently has a teaching appointment at the NTU Lee Kong Chian School of Medicine. Prior to joining NHG, he was Assistant Professor of Preventive Medicine and was a member of the medical staff executive committee of St Luke’s Medical Center in the Philippines.

Tel: 6496 6925



Li Ruijie
Msc (Occupational Theraphy)
Principal Research Analyst

Ruijie worked as an occupational therapist prior to joining NHG as a research analyst. He has experience working in both the acute and community healthcare settings in Singapore. Ruijie obtained his Masters in Hong Kong and has since worked on numerous research projects aimed at documenting and improving healthcare related outcomes both in Hong Kong and locally. His research interests include assessing psychometric properties of instruments and using various quantitative and qualitative methods in analysis and interpretation of the data collected in studies.

Tel: 6496 6944




Dr Meng Fanwen
MSc (Operations Research), PhD (Operations Research)
Principal Research Analyst

Fanwen completed his PhD programme in operations research at the NUS. Prior to joining NHG, he worked in NUS and the University of Southampton in UK. His recent research interests extend to capacity planning, resource allocation and scheduling in hospital, logistics in healthcare delivery system and dynamic treatment regimes.

Tel: 6496 6909





Sheryl Ng Hui Xian
BSc (Hons) (Statistics), MPH
Senior Research Analyst

Sheryl H.X. Ng holds a Master of Public Health (Specialization in Epidemiology and Quantitative Methods) from the Saw Swee Hock School of Public Health (SSHSPH), National University of Singapore (NUS). Prior to joining NHG, she worked on Electronic Medical Record (EMR) data and provided statistical and public health expertise in the National University Health System (NUHS). She has also provided biostatistics support to research projects in SSHSPH on physical activity and stroke. Her research interests include longitudinal data analysis and health service utilization patterns of geriatric populations.

Tel: 6496 6133






Dr Michelle Jessica Pereira
PhD, MPhty, BPhty (Hons I)
Principal Research Analyst

Michelle has a PhD in applied health economics. She is also a qualified physiotherapist, with postgraduate training (sports physiotherapy), who has practiced in a variety of settings in both Singapore and Australia. Her current portfolio at NHG-HSOR is focused on economic evaluations of health interventions for a variety of patient populations in Singapore. 





Palvannan Kannapiran
BEng (Mechanical Engineering), MEng (Industrial & Systems Engineering)
Head of Population Decision Analytics & Operations Research

Palvannan has developed decision models to improve understanding and support healthcare decision making. Starting from operations analysis and capacity planning, he has moved to MRSA disease modeling and population health analysis using databases. He has previously worked in the defense sector, developing optimization models for resource allocation.

Tel: 6496 6946





Palvinder Kaur
Bsc (Biomedical Science), MPH
Senior Research Analyst

Palvinder Kaur graduated from NUS Saw Swee Hock School of Public Health with a Masters in Public Health. She is currently working on health programme/service evaluation. Prior to joining NHG, she was with the Infectious Disease Research Laboratory, CDC TTSH doing HIV-1 Research.

Tel: 6496 6933



Christina Chieh Pann Pei
BSc (Biotechnology)

Senior Executive 

Christina is involved in several community projects, and handles research related administrations in HSOR. Prior to her employment in NHG-HSOR, Christina worked as an Executive (Operations) and Research Assistant in various community healthcare related projects.

Tel: 6496 6003



Reuben Ong Rong Ji
BA (Psychology), Magna Cum Laude)

Prior to his employment at NHG-HSOR, Reuben was working on psychology-business research as a research assistant at Nanyang Technological University. His current research interests lies in the field of clinical neuropsychology and includes neurodegenerative diseases like Alzheimer’s and dementia, traumatic brain injury and their impact on behavioral outcomes.

Tel: 6340 2425





Dr Sun Yan
MSc (Medical Informatics), PhD (Machine Learning)
Senior Principal Research Analyst

Dr Sun Yan has published widely in peer-reviewed medical journals. She has also been awarded a few national grants on developing disease prediction models as well as evaluating the cost and effectiveness of various screening strategies for infectious diseases (MRSA colonization, carbapenemase-producing gram negative bacteria (CPGNB)) and diabetes related complications (diabetic retinopathy and diabetic foot ulcerations etc.). Her current research interests focus on development and implementation of healthcare solutions leveraging on AI & big data analytics, microsimulation for cost effectiveness analysis and value-based care, etc.

Tel: 6496 6931





Jasmine Tan Hwee Ling
Advanced Diploma in Business Administration
Senior Executive Assistant

Jasmine is an executive assistant for HSOR. She handles the administrative matters in HSOR, including finance, human resource and IT matters. Prior to joining NHG, Jasmine was an experienced Finance Specialist in multinational corporation for more than 15 years.

Tel: 6340 2423





Dr Tan Woan Shin
BSocSc (Hons) (Econs), MSocSc (Econs), PhD (HSR)
Head of System Performance & Sustainability

Woan Shin's research focuses on the application of mixed methods in the design and evaluation of health services innovations with a special interest in the provision and financing of integrated care for geriatric and end-of-life populations. She was awarded the Health Manpower Development Programme (HMDP) fellowship in 2008 and the National Medical Research Council (NMRC) research training fellowship in 2015. Her work has been published in academic journals such as PLOS Medicine, BMC Medicine, Palliative Medicine and the Journal of American Geriatrics Society. She has held grants and commissioned projects totalling $5.7 million either as lead or co-investigator. Woan Shin also teaches at NUS and NTU as an invited lecturer within the field of Health Services Research.

Tel: 6496 6945




Teow Kiok Liang
BEng (Electrical Engineering), MSc (Industrial & Systems Engineering)

Senior Principal Research Analyst

Kiok Liang has worked on projects on the optimisation of hospital work processes for both outpatient and inpatient settings, and projections of national healthcare demands. He is on part time secondment to Ministry of Health. Prior to joining NHG, he was with the Defence Science & Technology Agency (DSTA). Kiok Liang’s key research interests include operations research, data mining, and health services planning.

Tel: 6496 6932






Dr Yap Chun Wei
BSc (Pharm) (Hons), PhD
Senior Principal Research Analyst

Chun Wei has worked as a principal investigator on many clinical informatics projects, particularly in the areas of oncology and chronic kidney disease. He has experience with the development of clinical decision support tools to aid in the individualization of therapy. His current research interest is in predictive analytics. Prior to joining NHG, Chun Wei worked as an Assistant Professor in Department of Pharmacy, National University of Singapore.

Tel: 6496 6643





Dr Yip Wan Fen
PhD (Ophthalmology), BSc (Hons) in Optometry
Senior Research Analyst

WanFen is a clinically trained-optometrist (allied health) with PhD training in ophthalmology and ocular epidemiology (National University of Singapore). Her research focus are in ophthalmology, epidemiology, chronic systemic diseases (hypertension, diabetes), and related target organ damage and mortality. Her notable publications include 1) Joint Effect of Early Microvascular Damage in Eye & Kidney on Risk of Cardiovascular Events, 2) Retinal microvascular abnormalities and risk of renal failure in Asian populations, 3) Emerging trends in diabetic retinopathy epidemiology. In her current role, she is involved in the designing and planning of health services research studies.

Tel: 6496 6940



Dr Zhu Zhecheng
MSc (Information Engineering), PhD (Industrial & System Engineering)
Senior Principal Research Analyst

Zhecheng holds a PhD in Industrial & Systems Engineering from NUS. His research area is applied optimisation and discrete event simulation. He has project experience in patient flow simulation, appointment scheduling, workload projection and data visualization, etc.

Tel: 6496 6624



A/Prof Ding Yew Yoong
Visiting Consultant

A/Prof Ding is a senior consultant at the Department of Geriatric Medicine and Institute for Geriatrics & Active Ageing (IGA), Tan Tock Seng Hospital, as well as Deputy Executive Director of the MOH Geriatric Education & Research Institute (GERI). He is also Clinical Associate Professor at Yong Loo Lin School of Medicine, National University of Singapore, and Adjunct Associate Professor at Lee Kong Chian School of Medicine, Nanyang Technological University. He obtained training in public health and social research methods at University of Queensland and London School of Economics. He also completed health services research fellowships at Bedford Veterans Affairs (VA) Center for Health Quality Outcomes & Economic Research in Massachusetts, USA, and Institute of Clinical Evaluative Sciences in Toronto, Canada. His substantive research interests include models of geriatric care, frailty, and geriatric syndromes, while his methodological focus is on quantitative methods, program evaluation, and implementation science.