Don became a 1969 NBA Finals champion with the Boston Celtics during his rookie year. He would also help the Celtics toward winning the 1974 NBA Finals. He had two stints with the Boston Celtics (1968–1975, and 1977–1980), for which he is most notable. He also had a short two season stint with the Los Angeles Lakers from 1976–1978, and also played in the ABA for one year with the Spirits of St. Louis from 1975-1976. Chaney was mostly known for his defensive skills, providing adequate numbers in minutes off the bench.