Ali Keshavarzian, MD, FRCP, FACP, MACG, AGAF the Josephine M. Dyrenforth Chair of Gastroenterology, Professor of Medicine and the Graduate College, Director of the Division of Digestive Diseases and Nutrition (1999), Director of the Institute for Advanced Study of the Gut, Chronobiology and Inflammation (2017) and Interim Section Chief of the Section of Community Epidemiology (2020) at Rush University Medical Center in Chicago, Illinois has been a practicing gastroenterologist with a specialty in managing patients with inflammatory bowel disease for over 30 years .

As a clinician scientist, he has been studying the impact of environmental factors [stress, alcohol, sleep and circadian disruption] on intestinal barrier function host/microbe interaction that promote intestinal and systemic [gut-derived] inflammation leading to initiation and/or progression of inflammatory disorders including IBD, IBS, food allergy, metabolic syndrome, alcoholic cirrhosis, NASH and Parkinson’s disease. He has contributed to over 350 published articles [h-index of 80] and book chapters and has over 20,000 citations. His works have been supported by multiple NIH, DoD, NASA and USDA grants. He was one of the first investigators to report the key role of oxygen free radicals in tissue injury in inflammatory bowel disease and one of the first investigators to begin to focus on the role of intestinal microbiota in health and disease in alcoholism, IBD, cancer, HIV and Parkinson. He is one of the early investigators to examine the effects of circadian and sleep disruption on GI tract and to report the negative impact of sleep and circadian disruption in IBD.