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Dr. Douglas K. Rex is distinguished professor of medicine at Indiana University School of Medicine, Chancellor's professor at Indiana University Purdue University Indianapolis, and director of endoscopy at Indiana University Hospital in Indianapolis. 

Dr. Rex graduated summa cum laude from Harvard College in 1976, and with highest distinction from Indiana University School of Medicine in 1980. He served as chief medical resident at Indiana University Hospital and joined the faculty at Indiana University in 1985. He has five times received the Outstanding Teacher Award for his Introduction to Medicine course, and has been awarded the Indiana University School of Medicine Outstanding Teacher Award, as well as the department of medicine's Excellence in Teaching Award.

Dr. Rex is a full-time clinical gastroenterologist at Indiana University Hospital. His major research interests have been in colorectal disease and, in particular, colorectal cancer screening and the technical performance of colonoscopy. He co-authored the colorectal cancer screening recommendations of the American College of Gastroenterology and of the Gastroenterology Consortium. He also chaired the U.S. Multi-Society Task Force on Colorectal Cancer from 2000 to 2006.

In addition, Dr. Rex has authored more than 140 original research papers, 45 book chapters, 150 invited papers and editorials, and 30 guideline papers. He is an associate editor of Journal Watch Gastroenterology and Reviews in Gastroenterological Disorders, and a member of the editorial boards of Clinical Gastroenterology and Hepatology, Journal of Clinical Gastroenterology, World Journal of Gastroenterology and Gastroenterology and Hepatology. From 2000-2006 Dr. Rex was the chairman of the U.S. Multi-Society Task Force on Colorectal Cancer. He has also served in the American College of Gastroenterology (ACG) as chairman of the board of governors and is a past president of the ACG.