Doctor of Dental Medicine (D.M.D.), University of Pennsylvania School of Dental Medicine, U.S.A., Professor William Cheung is an Honorary Professor, West China School of Stomatology, Sichuan University, China. Honorary Clinical Associate Professor, Restorative Dental Sciences of the University of Hong Kong Faculty of Dentistry, Hong Kong, he is an Adjunct Associate Professor, University of Pennsylvania School of Dental Medicine, U.S.A. Chairman of the FDI World Dental Federation Education Committee, prof. Cheung is a member of the International Editorial Board, Journal of the American Dental Association. He has given over 100 lectures and presentations worldwide and he is the authpor of over 20 scientific and other publications.