Dr. Calhoun received his D.V.M. degree from Oklahoma State University in 1989. He worked as an associate veterinarian at several clinics in OKC, did relief work in OKC and Edmond, and a short stint at the Oklahoma State Department of Health before purchasing Rock Knoll Animal Hospital from its founder Dr. Norm Adams in 1997. Dr. Calhoun joined the American Academy of Veterinary Dermatology in 1998 and has a special interest in allergies potensmedel för män and diseases of the skin. Dr. Calhoun serves on the board of directors of the Central Oklahoma Humane Society and is an active participant in animal welfare issues. In 2007 the Oklahoma Veterinary Medical Association presented Dr. Calhoun with the Companion Animal Practitioner of the Year award. He has been married to Susan for 32 years, they have 2 adult sons and 3 grandchildren.