Gastroenterologist Joseph B. Kirsner joined UChicago in 1935, then pioneered modern understanding and treatment of inflammatory bowel disease He was one of the first to show the link between ulcerative colitis and increased risk of colon cancer, introduced guidelines for how doctors should care for patients, and helped found the American Gastroenterological Association, the American Society for Gastrointestinal Endoscopy, and the American Association for the Study of Liver Diseases.