He represented the provincial and federal ridings of Lanark in eastern Ontario.
He was a member of cabinet in the provincial governments of George Drew, Thomas Kennedy and Leslie Frost.
He has the distinction of being the last Canadian federal Member of Parliament to be acclaimed into office.
Doucett was born in Ramsay Township located in Lanark County, Ontario, the son of Joseph Doucett and Martha Irwin, he was a farmer and insurance broker before entering politics.
Upon the death of the federal Member of Parliament for Lanark, William Gourlay Blair, in 1957, Doucett resigned from the Ontario Legislature and was acclaimed as a Member of Parliament in a 1957 by-election.