After eight years of practicing general veterinary medicine with a special interest in dentistry and oral surgery, Dr. Hall became a veterinary dentist. He is also a Fellow of the Academy of Veterinary Dentistry. He bought the Animal Dental Clinic and became a veterinary dental consultant to the National Zoo, in 2007. He continues his training by attending numerous professional meetings and hands-on laboratories. He has also given or assisted in more than 200 lectures and laboratory workshops for veterinarians, technicians, and pet owners, both nationally and internationally, on various topics in veterinary dentistry. He currently mentors two veterinary residents who travel from Nebraska and Vermont to train with him.

He volunteers his skills when needed at the National Zoo in Washington, DC, and for the Peter Emily International Veterinary Dental Foundation (PEIVDF). He is also a consultant for the Veterinary Information Network (VIN). He was honored to be selected for the PEIVDF Service Award in 2013, especially because this award was selected by his peers in exotic dentistry.