Dr. Leonard B. Weinstock is Board Certified in Gastroenterology and Internal Medicine. He is president of Specialists in Gastroenterology and the Advanced Endoscopy Center. He is an Associate Professor of Clinical Medicine and Surgery at Washington University School of Medicine. He is a primary investigator at the Sundance Research Center. Dr. Weinstock received a BA Magna Cum Laude from University of Vermont and the medical degree from University of Rochester School of Medicine. He completed his postgraduate training and was chief resident in Internal Medicine at Rochester General Hospital. His Gastroenterology Fellowship was performed at Washington University School of Medicine.

Dr. Weinstock is an active lecturer and has published more than 80 articles, abstracts, editorials and book chapters. He is currently researching the role of mast cell activation syndrome, small intestinal bacterial overgrowth, restless legs syndrome, and rosacea. Dr. Weinstock has extensive expertise with low dose naltrexone (LDN) in multiple inflammatory and autoimmune conditions. He is interested in colon cancer prevention and has expertise in colon cancer screening and advanced polypectomy techniques.