Dr. Noriaki Yoshida is Professor and Chair, Department of Orthodontics and Dentofacial Orthopedics Nagasaki University Graduate School of Biomedical Sciences Since 1990 he has been a faculty in the Department of Orthodontics, School of Dentistry, Nagasaki University. Now he is Professor and Chair of Department of Orthodontics and Dentofacial Orthopedics, Nagasaki University Graduate School of Biomedical Sciences. His research interest is in biomechanical analysis of orthodontic tooth movement. He was a research fellow at the Department of Orthodontics and Dentofacial Orthopedics, Free University of Berlin and Humboldt University, Germany from 1992 to 1994, and Visiting Professor, Orthodontics, Division of Craniofacial Sciences and Therapeutics, University of Southern California, USA in 2005. Prof. Yoshida has given many lectures and courses in different countries and is the author of more than 200 scientific papers.