As a player, he was in the shadow of his older brother Bobby Hull, where they were both teammates on the Chicago Black Hawks for eight seasons.

His best years were as part of the "MPH" (pun on 'miles per hour' using each player's last initials) line with centre Pit Martin and right wing Jim Pappin.

He played 14 seasons in the National Hockey League, with the Chicago Black Hawks (1964–77) and Detroit Red Wings (1977–78).

Hull has become known as a public speaker and comedian, and continues to operate a cattle farm raising Polled Hereford with his brother Gary in Northumberland County, Ontario.

He has written a book entitled "The Third Best Hull" (ECW Press) which contains entertaining and often hilarious memoirs of his hockey career.