Dr. Allen received his DVM from the University of Missouri in 1979 and has been practicing equine medicine ever since. Dr. Allen opened Virginia Equine Imaging in 1996 after selling the practice he formerly owned in Arizona (Arizona Equine Medical and Surgical Center).

Virginia Equine Imaging became the first privately owned and operated equine diagnostic imaging specialty clinic in the world. He had a vision to establish a practice that provides advanced diagnostic and sports medicine catered to the equine athlete in a way that had never been done before. During his transition from Arizona to Virginia, Dr. Allen served as the head veterinary services coordinator at the 1996 Olympic Games in Atlanta, acquiring the title of Arizona Equine Practitioner of the year.

Since moving to Virginia and establishing VEI Dr. Allen has found time to serve as Chairman of the USEF Veterinary Committee, the USEF Drug and Medication Committee, and the Medication Sub Committee for the Federation Equestre Internationale (FEI).

He served as the FEI Foreign Veterinary Delegate for the 1999 Pan American Games in Winnipeg, Canada, the 2000 Olympic Games at Sydney, and the 2012 Olympic Games in London. Dr. Allen was also the 2010 World Equestrian Games Official Veterinary Coordinator.

Dr. Allen is currently certified by the International Society of Equine Locomotor Pathology (ISELP) and serves as its Vice President and Executive Director. He also serves as the volunteer Chairman of the United States Equestrian Federation (USEF) Veterinary, Drug, and Medications Committees and on the FEI Veterinary and List Committees. Dr. Allen continues to see patients and share his knowledge with veterinary interns and clients on a day-to-day basis striving the share his knowledge with the equine industry both in his local community and around the world.