Dr. Clyde Watkins Jr's office locations. Capstone Medical Group. 2745 Dekalb Medical Pkwy, Suite 200. Lithonia, GA 30058. Capstone Medical Group. 465 Winn Way, Suite 100. Decatur, GA 30030. Dr Watkins is a very good listener. He takes meticulous notes so you don't have to repeat yourself on every visit..