- Former Director of Glaucoma Service, Singapore National Eye Centre
- Representative, Glaucoma section, National Committee of Ophthalmology
- Head, Glaucoma Research Group, Singapore Eye Research Institute
- Executive member, Asia-Oceanic Glaucoma Society 1995 - present
- Member, Advisory Board, Singapore Eye Research Institute 1997
- Member, Expert Panel IV for Drug Evaluation, MOH 1999-present
- Ethics Committee, Clinical Research Unit, SNEC
- Candidate, Glaucoma Society for the International Congress of Ophthalmology
- Member, Executive Research Committee, SNEC 1993 β 1997
- Member, Association for Research in Vision and Ophthalmology
- Secretary cum Treasurer, Singapore Society of Ophthalmology 1991-2
- Member, Mount Alvernia Hospital CME Committee 1998-present
- Member, Glaucoma Club Singapore, 1999-present
- Editorial Board, Eye on Asia 1998-present 14. Editorial board, Asia-pacific Journal of Ophthalmology
- Editorial Board, Asian Glaucoma Journal, 1999-present
- Editorial board, Hong Kong Journal of Ophthalmology 1998-present
- Clinical Senior Lecturer, NUS 1999 β present
- Reviewer, Ophthalmology, 2000
- Journal reviewer, EYE
- Journal reviewer, British journal of Ophthalmology
- Protocol reviewer, National Medical Research Council (NMRC)
- External Evaluator, Health Science Authority, Centre for Drug Evaluation
- Reviewer, Journal of Ophthalmologica
- Moderator, ARVO 2000, 2003
- Advisory Board Member, AOGS Congress, 2003
- Co-chair, Global Glaucoma Research, WHO, Prevention Glaucoma Blindness, Association of International Glaucoma Societies (AIGS), 2003
- Honorary Advisory Board Member, Vital Base Medical Database for Professional
- Member, The Glaucoma Society of the International Congress of Ophthalmology (ICO)
- Committee Member, Chapter of Surgeon (Ophthalmologist)
- Organising Chairman, 21st Congress of Asia-Pacific Academy of Ophthalmology meeting 2006
- Council member, Asia-pacific Academy of Ophthalmology
- Member, Complaint panel, Singapore Medical Council
- Angle Closure Glaucoma Committee, Association of the International Glaucoma Societies (AIGS)
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