1. Associate Professor, Department of Medicine, Division of Gastroenterology and Nutrition, University of Texas Health, Science Center at San Antonio.
2. Professor and Deputy Chairman, Department of Medicine, Division of Gastroenterology and Nutrition, University of Texas Health, Science Center at San Antonio, Chief, Medical Service, Audie Murphy VA Hospital.
3. Instructional Development Specialist, Department of Medicine, Division of Gastroenterology and Nutrition, University of Texas Health, Science Center at San Antonio.
4. Associate Professor, Department of Surgery, University of Texas Health, Science Center at San Antonio, and Audie Murphy VA Hospital.
5. Director of Instruction Development, Office of Educational Resources, University of Texas Health, Science Center at San Antonio.