MacDonald has stated that several teachers have played a pivotal role in his interest in sport. In primary school, his physical education teacher Gary Cole, an Australia international soccer player gave support and enthusiasm. In 1986, his family moved to Alice Springs and physical education teachers Shane Claridge and Michelle Parker, at Alice Springs High School, provided encouragement. He said: "They were the best teachers; they certainly gave me a big boost and helped to set my sights on track and field sports." He started powerlifting and wanted to compete in this sport at the Paralympics. However, Parker encouraged him to turn to athletics and in his final year at high school, he was selected for the Barcelona Paralympics.