Career
He was a cabinet minister in the government of Leslie Frost. Mapledoram was born in Fort William, Ontario, the son of William James Mapledoram. Mapledoram was a personnel manager for the Great Lakes Paper Company.
He died in Thunder Bay at the age of 80.
Mapledoram served as reeve for Neebing Township from 1947 to 1951. He also served as president of the local Chamber of Commerce.
In the 1951 provincial election, he ran as the Progressive Conservative candidate in the riding of Fort William. He defeated Liberal incumbent Charlie Cox by 752 votes.
He was re-elected in 1955.
He was Minister of Lands and Forests in the provincial cabinet from 1954 to 1958, but resigned from cabinet after he was implicated in the Northern Ontario Natural Gas scandal. He was defeated in the 1959 election by Liberal John Chapple. Cabinet posts.