
Dr. Michel Gagner was born in 1960 in Montreal, Quebec, Canada.
Dr. Gagner obtained a Diploma in Sciences at the Seminaire de Sherbrooke in 1978 and his M.D. from the Faculté de Médecine de l'Université de Sherbrooke in 1982. He did his surgical training at McGill University in Montreal from 1982 to 1988. During his residency, he completed 2 years of a Ph.D. program on human lipolysis in sepsis at the Royal Victoria Hospital at McGill University from 1984 to 1986. Dr. Gagner also completed fellowships in hepatic surgery at Hospital Villejuif in Paris, France and pancreaticobiliary surgery at Lahey Clinic Medical Center in Burlington, Massachusetts, from 1989 to 1990.
Upon completion of his fellowships, he was recruited to Université de Montréal, School of Medicine, Hôtel-Dieu de Montreal, where he was Assistant Professor of Surgery from 1990 to 1995. Following this, Dr. Gagner worked at the Cleveland Clinic Foundation in Cleveland where he co-founded the Minimally Invasive Surgery Center from 1995 to 1998. Dr. Gagner was appointed the Franz Sichel Professor of Surgery and Director of the Minimally Invasive Surgery Center of Mount Sinai School of Medicine in New York, from 1998 to 2003. He then joined Weill Medical College of Cornell University in New York, as Professor of Surgery and Chief of the Section of Laparoscopic and Bariatric Surgery from 2003 to 2007. He was until recently, Chair of the Department of Surgery at the Mount Sinai Medical Center in Miami and Professor of Surgery at Florida International University, and is currently Professor of Surgery in Montreal.
Dr. Gagner is known for his contributions in the field of Minimally Invasive Surgery, in particular the first description of laparoscopic adrenalectomy for Cushing syndrome and pheochromocytoma in 1992, the first description of laparoscopic pancreatectomy, distal and proximal, from 1992 to 1993, the first description of endoscopic neck surgery with parathyroidectomy in 1995, the first transgastric cholecystectomy in 1997, the first description of a laparoscopic duodenal switch for obesity in 1999 and laparoscopic sleeve gastrectomy in 2000. More recently, Dr. Gagner was co-surgeon for the first world transatlantic robotic cholecystectomy, between New York City and Strasbourg, France. It is the only surgical article published in Nature in 2001.
He has over 300 published journal articles, 40 book chapters, and 8 books on minimally invasive surgery. He has been a visiting professor and operated in over 60 institutions in 48 countries. He has held prominent positions in more than 35 societies and organizations and has served on the editorial boards of 12 surgical journals. Dr. Gagner has also received a number of honorary memberships and awards throughout his career. His most recent contributions focus on innovative upper digestive tract surgery such as bariatric and endoluminal gastric procedures.
Selected publications from PubMed
Psychometric assessment of PROMIS-29 as a measure of health status after metabolic and bariatric surgery: a prospective cohort study.
Roosta A, Fermi F, Gagner ML, Shirzadi S, Roversi K, Jain S, Gagner M, Andalib A, Feldman LS, Fiore JF Jr
Surg Obes Relat Dis. 2026 Aug 7 pii: S1550-7289(26)00817-8. doi: 10.1016/j.soard.2026.08.002.
Magnetic vs stapled technique in jejuno-ileal bipartition: one-year outcomes.
Fried M, Michalsky D, Buchwald JN, Charpentier D, Schneider J, Gagner M
Surg Endosc. 2026 Aug;40(8):6743-6754 doi: 10.1007/s00464-026-12934-y.
Magnetic Side-to-Side Duodeno-Ileostomy with the MagDI System: A Technical Description of the Initial Experience in Argentina.
Palermo M, Serra E, Serra F, Fuster M, Duza G, Gagner M
J Laparoendosc Adv Surg Tech A. 2026 Jun 23;:10926429261464826 doi: 10.1177/10926429261464826.
Creation of Side-to-Side Compression Anastomosis Using the GT Metabolic Solutions™ Magnet System, DI Biofragmentable (MagDI™ System) to Achieve Duodeno-Ileal Diversion in Patients with Obesity: Preliminary Italian Multi-Center Results.
Chiappetta S, Gentileschi P, Olmi S, Cesena G, Anselmino M, Gagner M
Obes Surg. 2026 Jan;36(1):11-19 doi: 10.1007/s11695-025-08409-z.
Sixth international consensus conference on sleeve gastrectomy.
Nocca D, Gagner M, Biertho L, Cuenca-Abente F, Nedelcu M
Surg Endosc. 2025 Oct;39(10):6282-6288 doi: 10.1007/s00464-025-11974-0.
Dr. Michel Gagner (Canada) and his team at the Westmount Square Surgical Center (Canada) will perform a Magnetic Limb Elongation: A Novel MinimalIy Invasive Strategy for Revisional Bariatric and answer all your questions.
With GT Metabolic Solutions
Published
Jun 2026
Dr. Michel Gagner (Canada) and his team at the Westmount Square Surgical Center (Canada) will perform a Laparoscopic Magnetic Gastro-Gastrostomy: A Minimally Invasive Reversal Technique for Roux-en-Y Gastric Bypass and answer all your questions.
With GT Metabolic Solutions
Published
Apr 2026
-for-revision-of-gastric-bypass.webp)
In this live surgery, Dr. Michel Gagner discusses the Magnetic Jejuno-Ileostomy (MagJI) as a specialized technique for the revision of gastric bypass. Developed in collaboration with GT Metabolic, the presentation details the clinical application of magnetic compression in creating anastomoses, providing surgeons with a technical overview of this minimally invasive approach for complex bariatric revisions.
With GT Metabolic Solutions
Published
Feb 2026

Dr. Michel Gagner was born in 1960 in Montreal, Quebec, Canada. Dr. Gagner obtained a Diploma in Sciences at the Seminaire de Sherbrooke in 1978 and his M.D. from the Faculté de Médecine de l'Université de Sherbrooke in 1982. He did his surgical training at McGill University in Montreal from 1982 to 1988. During his residency, he completed 2 years of a Ph.D. program on human lipolysis in sepsis at the Royal Victoria Hospital at McGill University from 1984 to 1986. Dr. Gagner also completed fellowships in hepatic surgery at Hospital Villejuif in Paris, France and pancreaticobiliary surgery at Lahey Clinic Medical Center in Burlington, Massachusetts, from 1989 to 1990. Upon completion of his fellowships, he was recruited to Université de Montréal, School of Medicine, Hôtel-Dieu de Montreal, where he was Assistant Professor of Surgery from 1990 to 1995. Following this, Dr. Gagner worked at the Cleveland Clinic Foundation in Cleveland where he co-founded the Minimally Invasive Surgery Center from 1995 to 1998. Dr. Gagner was appointed the Franz Sichel Professor of Surgery and Director of the Minimally Invasive Surgery Center of Mount Sinai School of Medicine in New York, from 1998 to 2003. He then joined Weill Medical College of Cornell University in New York, as Professor of Surgery and Chief of the Section of Laparoscopic and Bariatric Surgery from 2003 to 2007. He was until recently, Chair of the Department of Surgery at the Mount Sinai Medical Center in Miami and Professor of Surgery at Florida International University, and is currently Professor of Surgery in Montreal. Dr. Gagner is known for his contributions in the field of Minimally Invasive Surgery, in particular the first description of laparoscopic adrenalectomy for Cushing syndrome and pheochromocytoma in 1992, the first description of laparoscopic pancreatectomy, distal and proximal, from 1992 to 1993, the first description of endoscopic neck surgery with parathyroidectomy in 1995, the first transgastric cholecystectomy in 1997, the first description of a laparoscopic duodenal switch for obesity in 1999 and laparoscopic sleeve gastrectomy in 2000. More recently, Dr. Gagner was co-surgeon for the first world transatlantic robotic cholecystectomy, between New York City and Strasbourg, France. It is the only surgical article published in Nature in 2001. He has over 300 published journal articles, 40 book chapters, and 8 books on minimally invasive surgery. He has been a visiting professor and operated in over 60 institutions in 48 countries. He has held prominent positions in more than 35 societies and organizations and has served on the editorial boards of 12 surgical journals. Dr. Gagner has also received a number of honorary memberships and awards throughout his career. His most recent contributions focus on innovative upper digestive tract surgery such as bariatric and endoluminal gastric procedures.
Published
Jan 2026

Dr. Michel Gagner (Canada) and his team at the Westmount Square Surgical Center (Canada) will perform a Magnetic Duodeno-Jejunostomy for Superior Mesenteric Artery Syndrome (SMART) and answer all your questions. Clinical Background This procedure is a treatment for Superior Mesenteric Artery Syndrome (SMAS). SMAS is a rare condition where the third portion of the duodenum is compressed by a decreased space between the superior mesenteric artery and the aorta. Common Symptoms: It often presents with symptoms of proximal small bowel obstruction , such as postprandial epigastric pain, early satiety, nausea, vomiting , and significant weight loss. Typical Patient Profile: SMAS preferentially occurs in adolescents and young adults, with a general age range of 10 to 39 years. Complications: If diagnosis is delayed, it can lead to malnutrition and dehydration , sometimes requiring enteral support or TPN. Technique Description The procedure to be demonstrated is a Laparoscopic-Endoscopic Assisted Magnetic Duodeno-Jejunostomy Side-to-Side. This technique is presented as a new option for treating SMAS. Procedure Steps The SMART procedure aims to create a patent bypass of the duodenal obstruction. The general steps are: A magnet is delivered endoscopically into the compressed third portion of the duodenum. A second magnet is delivered laparoscopically into the proximal jejunum. The two magnets self-align and attract , creating a side-to-side compression anastomosis (a new connection) between the duodenum and the jejunum. Training Objectives To demonstrate how to create a patent duodeno-jejunostomy without enterotomies (incisions into the bowel). To understand the minimally invasive aspects of this technique for treating SMAS. To learn the setup and use of the magnetic delivery system and accessory instruments.
With GT Metabolic Solutions
Published
Nov 2025
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Dr. Michel Gagner (Canada) and his team at the Westmount Square Surgical Center (Canada) will perform a Magnetic Gastro-Ileostomy (MAGGI) for weight regain and answer all your questions.
With GT Metabolic Solutions
Published
Oct 2024
Help your network discover Dr. Michel Gagner's clinical expertise.