Dr. Mark Hans received his DDS and MSD degrees in dentistry and orthodontics at Case Western Reserve University. He is currently professor and chairman of the Department of Orthodontics at Case Western’s School of Dental Medicine, and has maintained an active orthodontic practice in Berea, Ohio since 1981. Dr. Hans is also actively engaged in research, his main interests being assessment of orthodontic outcomes and the demographics of orthodontic practice, 3D Imaging, and the orthodontist’s role in Obstructive Sleep Apnea Syndrome. He has lectured extensively on those subjects in the US and abroad. He is certified by the American Board of Orthodontics and is coauthor with Dr. Donald Enlow of the textbook on facial growth, “Essentials of Facial Growth”.