Zachary Callahan, MD

Dr. Callahan specializes in minimally invasive general surgery including weight-loss surgery.

He is fellowship-trained in primary and revisional weight-loss surgery including both traditional robotic procedures (sleeve gastrectomy, gastric bypass, duodenal switch) and exciting new incisionless procedures such as endoscopic sleeve gastroplasty, endoscopic revision of gastric bypass, and intragastric balloon placement. He also offers incisionless treatment of Achalasia, Gastroparesis, Zenker's Diverticulum, and early-stage cancers of the esophagus or stomach. He has additional training in foregut surgery (hiatal hernia repair and anti-reflux procedures including fundoplication). Lastly, he offers minimally invasive repair of both simple and complex abdominal wall hernias.

Dr. Callahan graduated Alpha Omega Alpha from the Cincinnati College of Medicine and then joined the Jefferson Surgical Residency in Philadelphia. At Jefferson, he logged over 1,100 general surgery cases and passed both Fundamentals of Laparoscopic and Fundamentals of Endoscopic Surgery examinations. During his time there, he received seven teaching awards, was accepted to the Gold Humanism Honor Society and was selected as Administrative Chief Resident in his final year.

After residency, he matriculated to his first-choice fellowship in Minimally Invasive Surgery (MIS) to train under foregut expert Michael Ujiki at Northshore University HealthSystem in Chicago. This fellowship is one of only a few programs in the country to be accredited in four categories of MIS training including Advanced GI MIS, Bariatric, Comprehensive Flexible Endoscopy, and Foregut.

Dr. Callahan has presented research at numerous national meetings; he has more than 30 publications and over 200 citations relating to minimally invasive surgery. He is an active member of the Society of American Gastrointestinal and Endoscopic Surgeons, American Foregut Society, and the American Society for Metabolic and Bariatric Surgery.

In his spare time, Dr. Callahan enjoys staying active, traveling, and spending time with his wife and Bernedoodle, "Carson."