Zachary Callahan, MD
Biography:
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 laparoscopic 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 or LINX placement.) 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 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.
Care Philosophy:
Accelerating recovery by using minimally invasive techniques.
Procedures and Conditions Treated:
- Gastric Sleeve
- Gastric Bypass Surgery
- Revision Surgery
- Single Anastomosis Duodenal Switch (SADI)
- Duodenal Switch Procedure
- Weight Loss Surgery
- Laparoscopic and Robotic Weight Loss Procedures
Specialties:
- Bariatric Surgery – Board Certified
- General Surgery – Board Certified
Education and Credentials:
- University of New Hampshire – Undergraduate Degree (2010)
- University of Cincinnati College of Medicine – Medical School (2015)
- Thomas Jefferson University Hospital – Internship (2016), Residency (2021)
- Northshore University Health System – Fellowship (2022)
Contact Information:
- Phone: 615-292-7708
- Fax: 615-292-7756
Click to visit Dr. Callahan’s clinic website
James T. Griscom III, MD
Biography:
A native of Nashville, Tennessee, Dr. Griscom was born at Centennial Medical Center. His grandfather, Dr. John Griscom, was an internist for many years at The Frist Clinic at Centennial. He went to elementary school at Overbook School and graduated high school from Montgomery Bell Academy. From there, he went to Furman University to play football where he majored in Religion and pre-medical studies. He attended the University of South Carolina School of Medicine in Greenville, South Carolina and subsequently continued training in general surgery in Nashville through the University of Tennessee Health Science Center. During residency, Dr. Griscom became very interested in minimally invasive gastrointestinal surgery along with bariatric surgery. He saw bariatric surgery as a means of treating multiple chronic diseases with a single surgery along with the comprehensive care that bariatric medicine provides to a growing number of patients affected by obesity. He was awarded chief resident of the year at the conclusion of his residency. He then was accepted and trained in advanced GI and minimally invasive surgery through Our Lady of the Lake Health System with the Surgeons Group of Baton Rouge in Louisiana. At that time, he participated in their bariatric program and trained extensively with the bariatric, foregut, and hernia surgeons. During his fellowship year, he performed nearly 600 surgeries. Following his training, he returned to his hometown and joined The Surgical Clinic. Dr. Griscom is married to his wife, Elizabeth, and they have three children – Ford, Evie, and George. In his spare time, he enjoys spending time with his family, walking his two labs, playing golf, or watching college football.
Care Philosophy:
Dr. Griscom has studied and trained extensively with the robotic platform and advanced laparoscopic techniques in order to provide patients with the best chance of success, recovery, and results. Bariatric surgery is a lifelong relationship with patients centered on mutual trust in order to provide optimal health. He strives to remember all aspects of the patient when considering weight loss surgery, and he wants to do what is best and tailored for the specific patient.
Procedures and Conditions Treated:
- Vertical Sleeve Gastrectomy
- Gastric Bypass Surgery
- Single Anastomosis Duodenal Switch (SADI)
- Revisional Bariatric Surgery
- Weight Loss Surgery
- Robotic Weight Loss Procedures
Specialties:
- General Surgery – Board Certified
Education and Credentials:
- Furman University – Undergraduate Degree (2014)
- University of South Carolina School of Medicine, Greenville (2018)
- University of Tennessee Health Science Center, Nashville (2023)
- Our Lady of the Lake – Surgeons Group of Baton Rouge, Advanced GI/MIS Fellowship (2024)
Contact Information:
- Phone: 615-329-7887
- Fax: 615-340-4537
Click to visit Dr. Griscom’s clinic website
MBSAQIP works to advance safe, high-quality care for bariatric surgical patients through the accreditation of bariatric surgical centers. A bariatric surgical center achieves accreditation following a rigorous review process during which it proves that it can maintain certain physical resources, human resources, and standards of practice. All accredited centers report their outcomes to the MBSAQIP database.†
