Dr. Harrison earned his medical degree from the University of Mississippi School of Medicine. He completed his internal medicine residency and gastroenterology fellowship at Brooke Army Medical Center and a 4th year advanced liver disease fellowship at Saint Louis University. He is board certified in both Internal Medicine and Gastroenterology. Dr. Harrison is currently a Visiting Professor of Hepatology at the Radcliffe Department of Medicine, University of Oxford. He is internationally known for studies in hepatitis C and non-alcoholic fatty liver disease with over 200 peer reviewed publications in these fields. Currently, Dr. Harrison currently serves as the Medical Director for Pinnacle Clinical Research and the President of Summit Clinical Research.