Medical Physics and Research Department, Hong Kong Sanatorium and Hospital, Hong Kong SAR, China

Former Head, Section of Nuclear Medicine, Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand

Konstantopoulio General Hospital, Athens, Greece

Harvard Medical School & Massachusetts General Hospital,Boston Secretary, ICRP Protection in Medicine Committee Formely: Professor of Medical Physics,AIMS,N.Delhi Radiation Safety Specialist, IAEA,Vienna Director of Radiation Protection,European Society of Radiolgy,Vienna

Director MSc Programmes Clinical Sciences King’s College London, UK Visiting Prof. Medical University Plovdiv, BG Consultant, King’s College Hospital London Dept. Medical Engineering and Physics London, United Kingdom