Director and Team

Mark H. Johnston, MD, FACP, FACG, AGAF
A former Navy Medical Officer, Dr. Johnston has treated members of Congress and served as gastroenterologist to the White House. He is a noted medical inventor, having patented a device to treat Barrett's Esophagus and early esophageal cancer. Dr. Johnston is board certified in Internal Medicine and Gastroenterology and earned his medical degree at Hahnemann University, Philadelphia. He completed his residency and GI fellowship at the National Naval Medical Center, Bethesda, MD.

Other team members

Joining Dr. Johnston in providing care tailored to each patient's needs are:

• Sadiya S. Cheshty, MD, with expertise in endoscopic ultrasound
• Justin J. Harberson, MD, with expertise in manometry
• Lavonne R. Johnston, MHS, PA-C, with expertise in Barrett's Esophagus.
• Faith Cranford, CGRN, nurse coordinator