1. Research Fellow, London School of Hygiene & Tropical Medicine, Department of Global Health & Development, London, UK; Overseas Research Associate], Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
2. Visiting Scholar Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore; Alumnus, London School of Hygiene & Tropical Medicine, Department of Global Health & Development, London, UK.
3. Research Fellow, London School of Hygiene & Tropical Medicine, Department of Global Health & Development, London, UK
4. Research Associate, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
5. Research Associate, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
6. Research Fellow, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
7. Intern, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
8. Senior Resident, Preventive Medicine, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
9. Partner, Stanford University, Stanford Distinguished Careers Institute, Stanford, USA
10. Associate Professor, Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore; Associate Professor, London School of Hygiene & Tropical Medicine, Department of Global Health & Development, London, UK