Dr. Chiasson's practice is characterized by managing complex surgical diseases of the GI tract. Dr. Chiasson is recognized both in the Tucson, Arizona community and internationally for his surgical treatment of obesity. He performs all of the established primary and revision weight loss surgical procedures including the Vertical Sleeve Gastrectomy, Gastric Bypass, Duodenal Switch, and Adjustable Gastric Band. He serves as an educational consultant for Ethicon Endosurgery teaching surgeons from around the country to perform the sleeve operation.