Dr. Barnes has been performing bariatric surgery since 1996, focusing now on the laparoscopic gastric bypass and the laparoscopic sleeve gastrectomy, as well as revisional surgery for failed Lap Bands and stomach staplings. He also performs other laparoscopic surgery, including gallbladder removal, hernia repair, and anti-reflux surgery.

Dr. Barnes is board certified by the American Board of Surgery. He has been a member of the American Society of Metabolic and Bariatric Surgeons for over 20 years. He is Chief of Surgery at Christus Highland Hospital. He is also very active in medical mission trips to many Third World countries such as Ecuador, Honduras, and Haiti.