Professor Leung graduated from The Chinese University of Hong Kong in 1992, and he received subspecialty training on Immunology and Allergy in the Hospital for Sick Children in Toronto, Ontario, Canada in 1997-1998. Professor Leung is currently a professor in Department of Paediatrics at The Chinese University of Hong Kong, and a visiting professor in the Central South University in mainland.  He is Immediate Past President of Hong Kong Society for Paediatric Immunology, Allergy and Infectious Diseases.  His main research interests include natural history, novel diagnostics and host-microbe interactions for allergic diseases.  He published more than 420 peer-reviewed journal articles.