Dr. Gregory S. Lesser is a gastroenterologist in Newark, New Jersey and is affiliated with multiple hospitals in the area, including Robert Wood Johnson University Hospital Rahway, Trinitas Regional Medical Center RWJBH, Ironbound Endo Surgical Center and Garden State Endoscopy & Surgery Center. He received his medical degree from American University of the Caribbean School of Medicine and has been in practice for more than 20 years. Dr. Gregory S. Lesser has expertise in treating colonoscopy, upper gi endoscopy, gastroenteritis, among other conditions - see all areas of expertise. Dr. Gregory S. Lesser accepts Medicare, Aetna, Cigna, Blue Cross, United Healthcare - see other insurance plans accepted. Dr. Gregory S. Lesser is highly recommended by patients.