||Associate Professor, Dept of Medicine, NUS.
Senior Consultant, Infectious Disease Physician, Department of Medicine, NUH.
Adj Senior Research Fellow, Defence Science Organisation, Singapore.
Assistant Dean (Education-Clinical), Faculty of Medicine, NUS.
Visiting Consultant, Alexandra Hospital, Singapore.
Consultant, Infectious Disease Physician, Department of Medicine, NUH.
Asst Professor, Dept of Medicine, NUS.
Senior Registrar, Dept of Med, NUH.
Clinical and Research Fellow, Infectious Diseases, University of Wisconsin Hospital and Clinics.
Resident, Weiss Memorial Hospital, University of Chicago Hospitals.
Resident, Department of Medicine, NUH.
Medical Officer, Singapore Armed Forces Medical Services.
Rotating Internship, Paediatrics, Medicine and Orthopaedic Surgery, NUH.