After retiring from politics in 1993, Mazankowski was a consultant with the law firm of Gowling Lafleur Henderson LLP.
He also served as a director or trustee for several companies, including Weyerhaeuser Co., ATCO Ltd., Shaw Communications Inc., and Power Corporation of Canada.
[2] After he completed high school, Mazankowski moved to Chicago, where he worked as a dispatcher in a trucking business.
[2] Mazankowski's first taste of politics came during his five-year tenure as a trustee of a local separate school.
This inspired him to seek the Progressive Conservative Party nomination in his local riding of Vegreville, which he won in 1968.
Mazankowski declined an offer of a Senate seat made by Mulroney in his final days as prime minister.
[20][21] In 1992, Mazankowski was one of a few prominent Canadians who were given the honorific style of "Right Honourable" without having held any of the offices that would entitle them to it automatically.