Dr. David Clarke received his B. A. in psychology from Williams College (Phi Beta Kappa), and his medical degree from the University of Connecticut in 1979. Since then he has successfully cared for thousands of patients with stress illness, often sent to him after other doctors were unable to help them. He has been a visiting professor at several international hospitals, including Oxford. He was also named a Top Doctor in the Portland Monthly magazine physician review in 2005 and 2006.

Dr. Clarke is a Clinical Assistant Professor of Medicine with Oregon Health and Sciences University, a Clinical Instructor at Pacific University, and a member of the Academy of Psychosomatic Medicine. He is board-certified in Gastroenterology and Internal Medicine, and has practiced in Portland, Oregon since 1984. He is a Gastroenterologist at Kaiser Sunnyside Medical Center, he is Ethics Director at Northwest Permanente, and he is Nutrition Support Team Director at Kaiser Sunnyside Medical Center.

David Clarke has received numerous awards for excellence in patient care. He developed and presented a monthly seminar on stress illness, and local doctors have given their patients 50,000 copies of his brochure on this topic. He lives in Happy Valley, Oregon, which is near Portland.