He played for the Calgary Wanderers in the Alberta Big Four League in 1919-20. After that league folded, Mackey spent the next three seasons playing senior hockey in Calgary. In 1923-24 he played for the senior Bellevue Bulldogs. The pro Calgary Tigers brought him up for the 1924-25 season. In 1925-26 he played with the Vancouver Maroons. After that team folded Mackey joined the newly-formed Rangers. Simpson was with the minor pro Boston Tigers from 1927 to 1931. In 1932 he returned to Calgary to play for the minor pro Calgary Tigers until 1934.