Dr. Belsley is an attending surgeon at Mount Sinai West Hospital in New York City. He treats morbid obesity with weight-loss surgery including the laparoscopic gastric bypass and the laparoscopic sleeve gastrectomy at Mount Sinai St. Luke's Hospital Center, a Bariatric Center of Excellence Hospital accredited by the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) and a member of the Mount Sinai Health System. His clinical practice also includes complex hernias, reflux surgery and operations on the intestines ranging from the esophagus to the colon.