DUNCAN Y. BROWN, DDS, DOrtho, has practiced orthodontics for 43 years in Calgary and has offices in Calgary, Canmore, and Okotoks. Dr. Brown has been fortunate enough to have been invited to teach the concept of passive self-ligation—a broadly recognized tool in orthodontics—in North America, Europe, Asia, and Africa. He is an associate clinical professor at the University of Alberta and served as a guest lecturer at the University of Manitoba, University of British Columbia, and University of Western Ontario. Dr. Brown is coauthor of The Protocol, a broadly circulated publication on the subject of passive self-ligation. He has served as a consultant for P&G, Carestream Dental, G&H Wires, Ormco, and OC Orthodontics.