After an earlier career as a carpenter and builder, Jon Geller, DVM, DABVP emeritusr graduated from Colorado State University College of Veterinary Medicine in 1995.. After graduating, he practiced as a house call veterinarian for several years, and then embarked on a 20 year career as an emergency clinician in Colorado. During that time, Geller and his partners started up 4 emergency clinics. He became Board Certified as Veterinary Practitioner in Canine and Feline Medicine in 2010.

After seeing a homeless man and his pit bull on a bridge in Nashville in 2015, he founded The Street Dog Coalition, a non-profit charity, which provides free medical care, and other related services, to pets of owners at risk of, or experiencing homelessness in over 50 US cities.

In March of 2022, shortly after the Russian invasion of Ukraine, The Street Dog Coalition went international, and Geller worked with several Romanian veterinarians to set up a vet clinic in a blue tent at the Romania-Ukraine border, where teams of veterinarians, vet students and technicians, known as the ‘Blue Vet Group’, have been providing free veterinary care to pets of Ukraine refugees. Since setting up the tent clinic, over 800 pets have been cared for and provided European Union pet passports to allow their owners to continue their travels westward. Currently, The Street Dog Coalition is partnering with other non-profits to bring the first mobile veterinary clinic into Ukraine to provide care for injured pets, as well as providing preventive care and sterilization services, in a long-term project with a goal of caring for 10,000 pets and horses.

Geller was named Veterinarian of the Year by the Colorado Veterinary Medical Association for 2019. In the spirit of unbridled learning, he is currently enrolled as an MPH candidate at the University of Minnesota. He received the ASPCA Henry Bergh Humane Award for 2022, and also is an Instructor in the Colorado School of Public Health teaching a class on ‘Homelessness in America.’