Dr. Schiller is a gastroenterologist and Professor of Medicine at Texas A&M College of Medicine at the Baylor University Medical Center Campus in Dallas, Texas. He is an internationally renowned authority on the causes and treatment of constipation and diarrhea. He speaks frequently at national and international meetings and regularly publishes review articles and book chapters dealing with these problems. He also studies new treatments for patients with diarrhea, constipation, and irritable bowel syndrome.