He served in the Legislative Assembly of Ontario as a Progressive Conservative from 1971 to 1990, and was a cabinet minister in the government of Bill Davis.
Wiseman was also a public school board chair, and a trustee of St. Paul's United Church in Perth, Ontario.
There was some speculation that Wiseman's removal was a result of a dispute with one of Davis's favourite deputy ministers, Alan Gordon.
"[8] In the fall of 1984, Davis, partly to ameliorate the situation, appointed Wiseman to a government commission promoting the sale of agricultural products to the Americans.
[7] The Progressive Conservatives, who had governed the province continually since 1943, lost power following the 1985 election but Wiseman was re-elected without difficulty.