David C. Hatcher, D.D.S., M.Sc., M.R.C.D.(c) received his D.D.S. degree from the University of Washington in 1973. Subsequently he completed two years active duty in the U.S. Public Health Service and a one year general practice residency program at the University of Vermont Medical Center. Following three years as an instructor and one year as acting director of the general practice residency and the hospital dental clinical at the University of Washington, Dr. Hatcher entered the graduate program in radiology at the University of Toronto and was granted a specialty degree in Oral and Maxillofacial Radiology in 1982 and an M.Sc. in 1983. His thesis topic dealt with radiology of mandibular dysfunction. Dr. Hatcher was an Associate Professor and Chairman of the Division of Radiology for five years at the University of Alberta, Canada. He was also Director of the Temporomandibular Joint Investigation Unit and Clinic while at the University of Alberta. Presently Dr. Hatcher is in private practice in Sacramento, California and has faculty appointments at both the University of Southern Nevada and the University of Pacific Dental Schools. He has published many articles and lectured extensively to medical and dental organizations in the United States and Canada.