American track and field athlete
According to Wikipedia,
Duncan E. MacDonald is an American long-distance runner. He ran collegiately for Stanford University and competed in the men's 5000 metres at the 1976 Summer Olympics. He was also a three-time winner of the Honolulu Marathon, in 1973, 1974 and 1980. In 2017, MacDonald was the boys and girls cross country coach at the Punahou School in Honolulu.