Mark Shackelford is a 1982 graduate of the Oklahoma State University College of Veterinary Medicine and a native Tulsan. He is a member of the Tulsa VMA, the American VMA, and is involved with the Oklahoma VMA. Married to Kathryn, their home is shared with 2 dogs and 2 cats. Dr. Shackelford and Wagner started their partnership in 1990, changing the name from Hohmann Veterinary Hospital to 15th Street Veterinary Group. He is an active supporter of OSU Cowboy football and anything orange and black [citation].