University of North Carolina at Chapel Hill
He is a clinical psychologist with additional training in gastrointestinal physiology. He graduated from the University of Chicago in 1973. Research interests include the pathophysiology and treatment of irritable bowel syndrome (IBS), fecal incontinence, and constipation; as well as gastrointestinal motility disorders, rectal pain, intestinal pseudo-obstruction, gastroparesis, dysphagia. His IBS studies focus on visceral pain sensitivity, genetics, diagnostic criteria, and the comorbidity of IBS with other somatic and psychiatric disorders. His pelvic floor research encompasses the epidemiology, pathophysiology, and treatment of constipation and fecal incontinence with biofeedback, behavioral training, and drugs. Major contributions have included randomized controlled trials (RCTs) of biofeedback for disordered defecation and fecal incontinence.