Dr. Clark is the Director of the Chronic Pain Treatment Program in the Department of Psychiatry and Behavioral Medicine at The Johns Hopkins University School of Medicine in Baltimore, Maryland. He is also an Associate Professor and has joint appointments in the Department of Otolaryngology-Head & Neck Surgery in the School of Medicine and the Department of Mental Hygiene in The Bloomberg School of Public Health.

Dr. Clark specializes in the care of patients with chronic medical illnesses. A fellow of the Academy of Psychosomatic Medicine, Dr. Clark currently devotes his research work to psychiatric phenomenology of sensory abnormalities such as chronic dizziness and pain, including studies on neuropathic pain. He serves on the National Institutes of Health Division of Research Grants Risk Prevention and Health Behavior Study Section.