Mark Johnston

Dr. Johnston is a graduate of Hahnemann Medical University and works in a private gastroenterology practice in Lancaster, PA. He is a retired Navy Captain and former head of gastroenterology at the National Naval Medical Center. He has joined multiple short term medical missions to Albania, Kenya and China. He holds two US patents for his GI research and has received numerous military, academic, research and humanitarian awards. He is the author of 17 Cairns, Encounters and Reflections from a Lifetime of Following God’s Trail