Professor Sung received his medical degree (MBBS) from The University of Hong Kong, and conferred PhD in biomedical sciences by the University of Calgary and MD by The Chinese University of Hong Kong (CUHK). He holds fellowships from the Royal Colleges of Physicians of Edinburgh, Glasgow, London, and Australia, the American College of Gastroenterology, the American Gastroenterological Association, the Hong Kong College of Physicians, the Hong Kong Academy of Medicine and Academy of Sciences of Hong Kong (ASHK). He is an Academician of the Chinese Academy of Engineering of the People's Republic of China and Academician of the International Eurasian Academy of Sciences.
He served as the Vice-Chancellor and President of the Chinese University of Hong Kong (2010 – 2017) and the Chair of Worldwide Universities Network (2016 - 2017).
Professor Sung is currently Distinguished University Professor, Senior Vice President (Health & Life Sciences) and Dean, Lee Kong Chian School of Medicine at Nanyang Technological University, Singapore. He is also Emeritus Professor of Medicine at CUHK.
He has published over 1000 full scientific articles in leading medical and scientific journals. He was listed as “Highly Cited Researchers”, released by the Clarivate Analytics, for the years 2018 to 2020. He has edited and authored around 30 books, as well as many chapters in major textbooks including the Oxford Textbook of Medicine (5th Ed.), Sleisenger & Fordtran's Gastrointestinal and Liver Disease (7th &8th Ed) and Yamada’s Textbook of Gastroenterology (4th Ed).