He served in the Legislative Assembly of Ontario from 1981 to 1987, and was briefly a cabinet minister in the government of Frank Miller.
[1] For the next four years, he served as a backbench supporter of the provincial Progressive Conservative administrations led by Bill Davis and Frank Miller.
[2] Stevenson was named Minister of Agriculture and Food on May 17, 1985, but accomplished little in this portfolio before Miller's government was defeated in the legislature.
He was defeated in the 1987 election, losing to Liberal Party candidate Bill Ballinger by 482 votes.
The Progressive Conservatives were badly defeated in the 1993 federal election, and Stevenson finished third in his bid for re-election behind Liberal candidate Alex Shepherd.