Charles served as Assistant Professor at Cornell University College of Veterinary Medicine until 1979, when he returned to Houston to establish Houston Veterinary Radiology Clinic, which became Sugar Land Veterinary Specialists in 2005.
He received his BS and DVM in Veterinary Science from Texas A&M University and an MS in Veterinary Medicine and Surgery from Auburn University. He is Board Certified by the College of Veterinary Radiology and is a member of the Harris County Veterinary Medical Association, the Texas Veterinary Medical Association, the American Veterinary Medical Association, and the American College of Veterinary Radiologists. In 2014, he received the TAVP Clinical Referral and Consulting Award.