Meet Our Physicians

The gastroenterology team at Mount Sinai South Nassau provides innovative and leading-edge endoscopic techniques to address a variety of gastrointestinal disorders.

Bhanu Singh, MD
Bhanu Singh, MD is the Interim in Chief of the Division of Gastroenterology, Hepatology. He is an advanced endoscopist who performs specialized endoscopic procedures to diagnose and treat diseases of the digestive system. He serves as Medical Director of the Center for Interventional Endoscopy at Mount Sinai South Nassau. He is board certified in internal medicine and gastroenterology.Dr. Singh earned his medical degree from the American University of Antigua College of Medicine. He completed his residency in internal medicine and fellowship in general gastroenterology at the Icahn School of Medicine at Mount Sinai, Elmhurst Hospital Center in New York, NY. He then completed fellowship training in Advanced Endoscopy at Virginia Commonwealth University in Richmond, VA.

Steven Friedman, MD
Steven J. Friedman, MD, is board certified in gastroenterology and internal medicine. He earned his medical degree from The University of Michigan Medical School, Ann Arbor, and completed his internal medicine residency and gastroenterology fellowship at Northwestern University, McGraw  Medical Center, in Chicago, IL.

Stephen Mulrooney, MD, FACG
Stephen Mulrooney, MD, FACG Stephen Mulrooney, MD, FACG, Director of Motility, Mount Sinai South Nassau, brings to his patients over thirty years of experience as a gastroenterologist. He is a graduate of the accelerated six-year Biomedical Program of RPI and Albany Medical College. After residency at St. Vincent’s Medical Center in Manhattan, he did his fellowship in gastroenterology at New York Medical College. He served as a Major in the United States Air Force, where he was Chief of Endoscopy at Robert L. Thompson Hospital, Fort Worth, Texas. He has authored numerous publications in gastroenterologyand has been an active faculty participant in fellowship programs. His areas of expertise include GERD, esophageal motility disorders, esophageal manometry, video capsule endoscopy, 24-hour pH studies, BRAVO,  anorectal motility disorders, endoscopy, and colonoscopy. He is board certified in gastroenterology and internal medicine.

Irving Levine, MD
Irving Levine, MD is a gastroenterologist who specializes in the treatment of Inflammatory Bowel Disease (IBD), including Ulcerative Colitis and Crohn’s Disease. Dr. Levine is the Director of IBD at Mount Sinai South Nassau. Dr. Levine oversees all aspects of IBD care, including medication management, biologic infusion therapy, endoscopic evaluation, and intervention. He works closely with his colorectal surgery colleagues to provide comprehensive IBD care. Dr. Levine is board certified in internal medicine and gastroenterology. Dr. Levine obtained his medical degree at Albert Einstein College of Medicine in the Bronx, NY, and completed his internal medicine residency at NYU Langone Health in New York City. He completed his general gastroenterology training at Northwell Health and IBD advanced fellowship at NYU Langone Health. Dr. Levine is published in peer-reviewed journals and has authored numerous manuscripts. He is an active member of American College of Gastroenterology (ACG) and American Gastroenterology Association (AGA).