Dr. Gentz was the director of veterinary services at the Wildlife Center of Virginia and has worked in the veterinary department of the Rio Grande Zoo & Albuquerque Aquarium in New Mexico. He has been a wildlife instructor at the veterinary school in Cornell, and also taught at Virginia/Maryland Regional College of Veterinary Medicine. Currently, he is a consultant for VIN in four areas: birds; small and exotic mammals; ruminants; and reptiles and amphibians.