NBC's Chloe Melas Reveals Symptom She Ignored for Months Before Bowel Disease Diagnosis Today - January 04, 2024 Thomas Ullman, M.D., explains how he treats patients with ulcerative colitis and how they can manage their condition to minimize its effects. Dr Ullman is professor of medicine at Einstein, chief of the division of gastroenterology, and a gastroenterologist at Montefiore.