Dr. John Harrison, a Doctor of Osteopathic Medicine, practices general surgery in the Digges Road Office Center in Manassas. Dr. Harrison graduated from the Philadelphia College of Osteopathic Medicine in 2000 and is board certified for general surgery by the American Board of Surgery. Dr. Harrison served 3 years as a General Medical Officer in the US Navy prior to completing his residency at the Lehigh Valley Hospital Department of Surgery at Penn State and the University School of Medicine in Allentown, Pennsylvania.