Dr. Greenwald is currently Director of Clinical Gastroenterology and Endoscopy at Mount Sinai Hospital in New York and Professor of Medicine at the Icahn School of Medicine at Mount Sinai. Previously, he was Fellowship Program Director in Gastroenterology at Montefiore Medical Center/Albert Einstein College of Medicine for nearly two decades, and was Associate Division Director of Gastroenterology at Montefiore Medical Center in the Bronx, NY. He was a Medical Director of the Advanced Endoscopy Center.

Dr. Greenwald graduated with a bachelor’s degree from Wesleyan University, and attended the Albert Einstein College of Medicine, where he earned an MD. He did a residency in Internal Medicine followed by a Gastroenterology Fellowship, both at Columbia Presbyterian Medical Center in New York. He is a past president of the New York Society for Gastrointestinal Endoscopy, and currently serves as that organization’s Education Director. He is Secretary of the American College of Gastroenterology and a member of the Board of Trustees, and previously was Chairman of the Board of Governors. He has been active in many ASGE Committees, and was Chairman of the ASGE’s Public and Member Outreach Committee. He was recognized by ASGE with a Master Endoscopist Award in 2006. He is a Board Member of GIQuIC, the GI Quality Improvement Consortium. He has been a member of the Steering Committee of the National Colorectal Cancer Roundtable, and is now the Co-Chair of that organization’s Public Awareness and Social Media Task Group. In New York, he is the co-chairman of the Citywide Colorectal Cancer Control Coalition (C5). He served for many years as the Chairman of the Subcommittee on GI Endoscopy for the American Society for Testing and Materials (ASTM).

His interests in endoscopy include new technology, reprocessing and infection control in endoscopy, training, quality in endoscopy, sedation, patient preparation, GERD, colon cancer screening and prevention, and capsule endoscopy.