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Bariatric Surgery

The mission of The Obesity Society’s Bariatric Surgery Section is to advance the science of bariatric surgery and the clinical management of the bariatric surgery patient utilizing a multidisciplinary approach.



  • Content development and organization of a “Bariatric Day” of Symposia for TOS 2011
  • Obesity Week 2013 Combined Symposia Development—the above stated goal is a preliminary step toward this longer-term project
  • Increased use of electronic resources such as: website bulletin board, list-serv, and links to our department's web-based journal club
  • Continue to build content of our newsletter with relevant information for our membership
  • Develop and distribute information regarding ongoing studies involving bariatric surgery with biannual updates
  • Develop an electronic bariatric surgery journal club


November 2012 Newsletter

September 2012 Newsletter

April 2012 Newsletter

January 2012 Newsletter

September 2011 Newsletter

April 2011 Newsletter

February 2011 Newsletter

July 2010 Newsletter

April 2010 Newsletter

March 2010 Newsletter


Join the Bariatric Surgery Section

All section members must be a member of The Obesity Society. 

If you are not a member of The Obesity Society, join today.  Be certain to select the Bariatric Surgery Section when completing your profile.

If you are already a member and would like to join the Bariatric Surgery Section please login to your member profile and select the Bariatric Section. Once you have updated your profile, you will receive all communications pertaining to the section.

Please contact Shameeka Green, This e-mail address is being protected from spambots. You need JavaScript enabled to view it , Volunteer Coordinator if you have any questions. 


Bariatric Surgery ListServ

Section Listservs are now available for TOS members! Listservs are a great place to find and to share knowledge and ideas. Sign up Today!

How To Sign Up for a ListServ

Member Listserv Rules & Etiquette




Lee Kaplan, MD, PhD (Chair, 2013-2015)

Massachusetts General Hospital, Boston, MAlee kaplan 

Lee Kaplan, MD, attended medical school at Yeshiva University Albert Einstein College of Medicine and graduated in 1981. He underwent additional gastroenterology and internal medicine training at Massachusetts General Hospital. His is the director of the Obesity, Metabolism & Nutrition Institute and founding director of the Weight Center at the Massachusetts General Hospital and associate professor of medicine at Harvard Medical School. He is the director of the subspecialty fellowship program in Obesity Medicine and Nutrition at MGH, director of the NIH-sponsored Small Animal Metabolic Surgery Core Resource, associate director of the NIH-sponsored Boston-area Nutrition and Obesity Research Center, and Immediate Past Chair of the Campaign to End Obesity.


Leslie Heinberg, PhD (Chair Elect, 2013-2015)

Cleveland Clinic, Cleveland, OH

Leslie Heinberg, PhD, is a Clinical Psychologist and Director of Behavioral Services for the Bariatric and Metabolic Institute at the Cleveland Clinic. She is also an Associate Professor of Medicine in the Cleveland Clinic Lerner College of Medicine of Case Western Reserve University. She has been a member of TOS since 2005. Her research and clinical interests include psychosocial aspects of bariatric surgery and weight loss outcomes, eating disorders and disorders of body image.


Samer G. Mattar, MD (Secretary/Treasurer 2013-2015)Mattar.jpg

Oregon Health & Science University

Samer G. Mattar, M.D, is Professor of Surgery, and he is the Chief of Bariatric Services at OHSU. Dr. Mattar's areas of interest include the optimization of outcomes of weight loss surgery, including the improvement, or cure, relevant comorbidities; bariatric surgery in adolescents; the treatment of patients with relapsed weight gain and high-risk bariatric patients. He also has an interest in the laparoscopic treatment of gastroesophageal reflux disease and other diseases of the foregut and the endoscopic diagnosis and treatment of foregut diseases. His areas of research include bariatric surgery outcomes, metabolic pathophysiology and surgical education. Dr. Mattar has held leadership positions at ASMBS and SAGES, and has been a member of TOS since 2003.


Adrienne Youdim, MD (Past Chair 2014-2015)

Cedars Sinai Medical Center, Los Angeles, CA

Adrienne Youdim, MD is the Medical Director of Center for Weight Loss at Cedars Sinai Medical Center and Co-Director of the Weight Loss, Center of Excellence. She is also the Assistant Clinical Professor of Medicine at UCLA David Geffen School of Medicine. Her background is in internal medicine and is certified as a physician nutrition specialist. Her areas of interest include implementation of standardized best practices for the pre- and post- operative care of the bariatric patient and in providing resident education in the area of obesity. Dr. Youdim has been a member of TOS since 2005.


Steven Heymsfield, MD, FTOS (Council Liaison 2014-2016)Steven Heymsfield

Pennington Biomedical Research Center, Baton Rouge, LA

Steven B. Heymsfield, M.D. is the Executive Director of Pennington Biomedical Research Center of the Louisiana State University System and he holds the George A. Bray, Jr. Chair in Nutrition. Previously he was the Global Director of Scientific Affairs for the obesity franchise at Merck & Co. where he oversaw scientific aspects of the Company's obesity drug development program. Dr. Heymsfield received a degree in medicine from Mount Sinai School of Medicine, and he completed his internship and residency at Emory University, continuing on to become a Fellow in Medicine prior to his Columbia University appointment as Professor of Medicine and Deputy Director, New York Obesity Research Center, in 1986. Dr. Heymsfield has published more than 450 peer-reviewed papers covering topics such as obesity, anorexia nervosa, bulimia nervosa, malnutrition, pregnancy, body composition, and caloric expenditure. His contributions to the study of human nutrition led to the TOPS Award from NAASO, the Rhoads Award of the American Society of Parenteral and Enteral Nutrition, and the Forbes Memorial Award Lecture, International Society of Body Composition Research. He was honored for his role in the FDA ban on ephedra, receiving the 2004 NYC Mayor's Award for Science and Technology. Dr. Heymsfield was elected Fellow of the American Society for Nutrition in 2009 and Fellow of the American Society of Parental and Enteral Nutrition in 2012a. In addition to his strong interest in biological method development, Dr. Heymsfield maintains an active clinical research program, extending his earlier research at Columbia University. Dr. Heymsfield is past President of the American Society of Clinical Nutrition and of the American Society of Parenteral and Enteral Nutrition.

(Please note: External Links are provided as a courtesy. The Obesity Society is not responsible for the content on sites accessed through external links.)

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