Dr. Leonard B. Weinstock is Board Certified in Gastroenterology and Internal Medicine. He is an Associate Professor of Clinical Medicine and Surgery at Washington University School of Medicine. 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 140 articles, abstracts, editorials and book chapters. He is currently researching mast cell activation syndrome, small intestinal bacterial overgrowth, restless legs syndrome, mold toxicity, and rosacea. Fifteen articles related to MCAS have been published within the last 5 years. He has given lectures throughout the country and in France. Dr. Weinstock is a primary investigator on pharmaceutical studies with two research centers.