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Our Directors

Ariel Ortiz MD, FACS, FASMBS

Dr. Ariel Otiz is one of the nation’s pioneers in bariatric surgery. He has over 30 years of experience in the field of metabolic surgery and medical education, which led him to create the International Institute of Metabolic Medicine, a cutting-edge center for academia, research, and management of obesity and its related diseases. He is also the Global Director of Communications at IBC – Oxford University, where he oversees the world’s largest network of tele-education in bariatric surgery. His passion for teaching and elegant surgical technique have positioned him as one of the most in-demand proctors in the United States and Canada for training bariatric surgeons. View CV

Santiago Horgan MD, FACS, FASMBS

Dr. Horgan is Professor of Surgery at UC San Diego, Head of the Department of Minimally Invasive Surgery, Director of the Center for the Future of Surgery (CFS), Vice President of Business Development and Medical Director of the International Institute of Metabolic Medicine (IIMM). An internationally recognized expert in robotic surgery, pioneer in the surgical treatment of morbid obesity; specialist in surgery and physiology of the esophagus; and a leader in the emerging field of Natural Orifice Transluminal Endoscopic Surgery (NOTES). As CFS Director, Dr Horgan works with colleagues to advance the techniques of surgical care by researching , developing, testing, and teaching procedures that will revolutionize the field of surgery. View CV

Arturo Martínez MD

Dr. Arturo Martinez has over 20 years of experience in the field of bariatric and minimally invasive surgery. Internationally recognized for his impeccable surgical technique, his advanced laparoscopy studies at the Ramon y Cajal Hospital in Madrid, and his years of experience training surgeons from the United States and Canada. Passionate about teaching and research, he currently serves as Director of the Department of Metabolic Surgery at the IIMM. View CV

Roberto Rumbaut MD

Dr. Rumbaut specializes in bariatric surgery, with the best techniques and treatments that improve the quality of life looking for a healthy body weight. He graduated in Medicine from the Instituto Tecnológico de Monterrey ITESM, afterwards he completed his specialty studies in Italy, becoming an expert in performing laparoscopic gastric bypass and adjustable gastric banding through a single laparoscopic incision. View CV

Haris Khwaja MD

Dr. Khwaja is Consultant Upper GI/Bariatric Surgeon at Chelsea and Westminster Hospital, London and Director of the IBC Oxford World Congress. He was educated at Christ Church, University of Oxford and Royal Free Medical School, University of London. At medical school he was awarded 1 scholarship, 21 Prizes, 4 Distinctions and was Proxime Accessit to the 1997 University Gold Medal.

In 1998 he started his surgical training in General/Vascular Surgery at the Royal Free Hospital. In 1999 he continued his training at the John Radcliffe and Churchill Hospitals, University of Oxford training in General Surgery/Renal Transplantation & Urological Surgery. From 2001 – 2004 he undertook a PhD at the University of Oxford. Following his period of research he undertook Higher Surgery Training in General Surgery in Northwest London and specialised in Advanced Laparoscopy/Upper Gasrointestinal & Bariatric Surgery at Chelsea & Westminster Hospital, Charing Cross Hospital, Royal Marsden Hospital and Luton and Dunstable Hospital. During his 5th year of surgical training he was matched to the 1 year Clinical Fellowship in Minimally Invasive/Bariatric Surgery at the Cleveland Clinic, Ohio, USA from 2009 – 10. In 2011 he undertook a second Fellowship in Advanced Laparoscopy/Bariatric Surgery at Phoenix Health, Liverpool, UK.

Dr.Gabriela Maldonado

Dr. Maldonado began her practice in General & Bariatric Surgery serving at Public Institutions since 2012. She was a member of the surgical bariatric team at the first free government program for bariatric surgery at Ruben Leñero’s Hospital, where were performed more than 2000 procedures, from 2013 to 2017, with a very active participation in educational activities as professor with fellows and performing innovative bariatric procedures including the first SADI-S cases in Mexico in 2015.

Simultaneously she was doing her private practice at Angeles Pedregal Hospital since 2011 as a member of the Obesity and Metabolic Syndrome Institute, performing several gastrointestinal and bariatric surgeries including robotics and the First cases of Bariclip in Mexico in May 2021. View CV