Donald E. Arens, DDS, MSD, is professor emeritus in endodontics at Indiana University. In the five decades that he has taught and practiced endodontics, Dr Arens has served as president of the American Association of Endodontists (AAE), the American Academy of Esthetic Dentistry, and the International Federation of Endodontic Associations. He is a fellow in both the American and the International College of Dentists and has been the recipient of many prestigious awards, including the AAE Coolidge Award, the Louis I. Grossman Award of the French Endodontic Society, the Indiana University School of Dentistry Distinguished Alumni Award, and the Japan Endodontic Association Wakai Award. Dr Arens has published extensively on endodontic topics in articles and textbook chapters and co-authored the first textbook devoted to endodontic surgery (Endodontic Surgery, Harper-Row, Lippincott).-------------------------Alan H. Gluskin, DDS, is professor and chairperson of the Department of Endodontics at Arthur A. Dugoni School of Dentistry, University of the Pacific in San Francisco, California. He earned his dental degree from the University of the Pacific School of Dentistry in 1972 and his endodontic certification from Temple University in Philadelphia, Pennsylvania, in 1976. A Fellow of both the International and the American College of Dentists, Dr Gluskin has published numerous articles and book chapters in the field of endodontics and lectures worldwide. He serves on the editorial boards of the Journal of Endodontics and the International Journal of Endodontics and is coeditor of the textbook Decision Making in Dental Treatment Planning (Mosby).