• Clinician, Gynaecological Endocrinology Clinic, Infertility Clinic
• Clinician, Climacteric and Menopause Clinic
• Senior Clinical Lecturer, National University of Singapore
• Head of Dept of O&G, SGH : October 1997 to December 2003
• Directorship / Membership of Statutory Boards : Thye Hua Kwan Community Hospital
• Member, American Fertility Society
• Member, European Society of Human Reproduction and Embryology
• Member, International Menopause Society
• Vice President, Obstetrical & Gynaecological Society of Singapore (OGSS) : 1995 – 1996
• Committee Member of Chapter of O&G, Academy of Medicine : 1995 - 1996
• Chairman, Chapter of O&G, Academy of Medicine : July 1999 to 2000
• Committee Member of Endocrine & Metabolic Society, Singapore : 1995 - 1996
• Member, Scientific Committee ISGE : 1995 – 1996
• Organiser of DUB Symposium, Chapter of O&G, Academy of Medicine, Singapore
• Chairman, Chapter of O&G, Academy of Medicine : 1996 – 1999
• Member, SGH Ethics Committee : 1997 – to-date
• Member, Accreditation Subcommittee, SGH : 1997 - 2000
• Member, Clinical Classification Committee, MOH : 1997 - 2000
• Member, Specialist Training Committee in O&G, MOH : 1998 – 2005
• Member, Medical Audit Committee, SGH : 1998 - 1999
• Secretary, Menopause Research Society of Singapore : 1998 – 1999
• Secretary, Menopause and Estrogen Deficiency Awareness (MEDA)
• President, Menopause Research Society of Singapore : 1999 to 2002
• Vice President, Menopause Research Society (Singapore) : 2003 - 2005
• Coordinator, MOH Clinical Practice Guideline on HRT : 2003 - 2004
• Workgroup Chairman, MOH Clinical Practice Guidelines on Hormone Replacement Therapy : 2003 – 2004
• Deputy Chairperson, Institutional Review Board, SGH
• Committee Member, Section of Reproductive Medicine, College of Obstetricians & Gynaecologists, Academy of Medicine : 2005 – to-date
• Deputy Chairperson of Moral Home for the Disabled Children, Thye Hua Kuan Society : 2006
• Scientific Committee member of Singapore Menopause Congress : 2005 - 2006
• Member, Royal College of Obstetricians & Gynaecologists
• Member, Singapore Medical Association
• Member, Menopause Research Society, Singapore
• Member, Asia Pacific Menopause Federation