 Prof. Janowitz served on many editorial boards, including "Journal of Chronic Diseases" (now known as "Journal of Clinical Epidemiology"), the "American Journal of Physiology" and was a contributor to "Gastroenterology Clinics".He also was known for the resurrection of the "American Journal of Digestive Diseases" which existed from 1956 to 1966.He was a member of the Association of American Physicians and Surgeons and served as Committee chairman with the American Gastroenterological Association and on the National Scientific Advisory Board of the National Foundation for Ileitis and Colitis.