1. Department of Surgery, The University of Hong Kong. Civilian Consultant in Anaesthesia to the British Army in Hong Kong
2. Department of Surgery, The University of Hong Kong. Formerly Consultant Anaesthetist-in-charge, Government Medical and Health Services, Hong Kong; Consultant Anaesthetist-in-charge, Caritas Medical Centre, Kowloon.
3. Faculty of Anaesthetists, RACS and Chairman, Board of Primary Examiners.