Originating originally from Montana Originating from Montana, originally from Montana, Dr. Christensen has been practicing dentistry in Nebraska and Texas for over two decades. He is also a well-known teacher and prosthodontist. He was a pioneer in the field of prosthodontics and education. launched Clinical Research Associates and the CR Foundation. He is currently director of the foundation's chief executive office as well as an active chairman of the foundation's board. Apart from practicing dentistry the doctor. Christensen is an active member of the American Dental Association, the Nebraska Dental Association, and the International College of Dentists. Dr. Christensen and his wife conduct research and share their findings in the Clinicians Report.