Career
He represented Bonaventure in the Canadian House of Commons from 1958 to 1962 as a Progressive Conservative. He was born in Saint-Godefroi, Quebec, the son of Simon Grenier and Marie-G. Hirard, and was educated at the Séminaire de Gaspé. Grenier practised law at New Carlisle, Quebec.
He was an unsuccessful candidate for a seat in the Quebec assembly in 1948.
Grenier was defeated when he ran for reelection to the House of Commons in 1962 and 1963.