Department of Clinical Research and Education

Dr. Tim Ritter
Senior Medical Director, Luminal Research Division
Dr. Tim Ritter was born in San Antonio and raised in Amarillo, Texas. He received a Bachelor of Science degree from Texas A&M University in 1984 and attended medical school at the University of Texas Southwestern Medical School in Dallas. Following medical school, Dr. Ritter did his internship and residency in internal medicine at Parkland Memorial Hospital and was board certified in internal medicine in 1990 and re-certified in 2000. Dr. Ritter completed his gastroenterology fellowship at Parkland Memorial Hospital in 1993. He was board certified in gastroenterology in 1993 and re-certified in 2000 and 2013. He has been actively involved in clinical research with TDDC since 2009 and has been a principal investigator in over 30 trials involving Crohn’s disease, ulcerative colitis, irritable bowel syndrome, celiac disease, and GERD. He has been a sub-investigator in hepatology for studies involving Hepatitis C, PBC, and fatty liver. His passion for research comes from seeing new therapeutic options for patients become available through clinical trials.

Dr. James Trotter
Medical Director, Hepatology Research Division
Dr. Trotter completed his internal medicine residency at UT Southwestern in Dallas and a GI fellowship and Transplant Hepatology fellowship at Duke University Medical Center where he served as an attending physician for two years. He was then recruited to the University of Colorado where he ran a busy clinical research practice in chronic liver disease, living donor liver transplant, and liver transplantation. He then assumed the role of Director of Hepatology at Baylor University Medical Center in 2009. He is the Deputy Editor for the journal Liver Transplantation and Associate Editor for the American Journal of Transplantation and co-author of the book Medical Care of the Liver Transplant Patient. He has authored over 200 peer-reviewed papers and book chapters.

Dr. J. Casey Chapman
Regional Medical Director – Louisiana
Dr. Chapman earned his medical degree from Louisiana State University’s School of Medicine and completed his internship, residency, and fellowship at Louisiana State University’s Health Science Center. He has a strong interest in Inflammatory Bowel Disease and was featured on Baton Rouge Business Reports Forty Under 40. Dr. Chapman is a member of the American College of Gastroenterology, Louisiana Gastroenterology Society, and American Gastroenterology Society. In his free time, Dr. Chapman enjoys beekeeping, gardening, traveling, and cooking.