Susan L. Lucak, M.D. Assistant Professor of Clinical Medicine Division of Digestive and Liver Diseases Columbia University Medical Center Dr. Lucak is an Assistant Professor of Clinical Medicine in the Division of Digestive and Liver Disease at Columbia University Medical Center. Her clinical interest is in functional bowel disorders, particularly irritable bowel syndrome (IBS). Her research efforts have focused on evaluating the clinical safety and efficacy of treatments for patients with IBS. Dr. Lucak is a member of several professional organizations including the American Gastroenterological Association, American College of Gastroenterology, American Society for Gastrointestinal Endoscopy, American College of Physicians, Functional Brain Gut Research Group, and the International Foundation for Functional Gastrointestinal Disorders.