Dr. Gagner is a well-respected surgeon known for his contributions to laparoscopic and bariatric surgery. Born in Montreal, Quebec, Canada, he first studied at the Séminaire de Sherbrooke where he obtained a Quebec College Diploma in 1978 followed by an MD at Université de Sherbrooke in 1982. Completing his residency in general surgery at McGill University in Montreal, during which time he did research studies on human lipolysis in sepsis, he then went to Paris, France to complete a fellowship in liver surgery and a second fellowship in pancreas and complex GI surgery at the Lahey Clinic in Massachusetts.

Most recently serving as chief surgeon at Mount Sinai Hospital in Miami and professor of surgery at Florida International University, Dr. Gagner is now working out of the affiliated University of Montreal’s Sacré-Coeur Hospital, as a professor of surgery and senior consultant. He also owns the Westmount Square Surgical Center, a private clinic specialized in bariatric surgery for weight loss and metabolic surgery for type-2 diabetes. World-renowned for laparoscopic and bariatric surgery related to weight loss, the Clinic of Dr. Gagner, which is located in Montreal, specializes in the laparoscopic sleeve gastrectomy which he pioneered in 2000, as well as laparoscopic duodenal switch, which he was the first to perform in 1999, and various new innovative endoscopic treatments for obesity, type-2 diabetes, and gastro-intestinal tract disorders.