Marvin L. Hanson, PhD, is one of the founders of the IAOM, and served two terms as president. He retired as Chair, Department of Communication Disorders, at the University of Utah, in 1994, after serving in that position for ten years. He is a Fellow in ASHA. He presently is engaged in a part-time private practice in speech pathology in Kitty Hawk, North Carolina. He is co-author of several textbooks, and single author of one, Articulation (W. B. Saunders, Philadelphia, 1983). He has published over 40 articles in professional journals, many of which were reports of his own research in orofacial myology. Robert M. Mason, DMD, PhD, is in private practice in orthodontics in Durham, North Carolina. He was previously Professor and Chief of Orthodontics at the Department of Surgery, Duke University Medical Center. He is past president of the American Cleft Palate-Craniofacial Association, and is a Fellow in ASHA. He has served in several capacities with the IAOM, and has contributed a great deal of clinical research about interdisciplinary interactions in the areas of craniofacial anomalies and oral myofunctional disorders.