Born in Montreal, Dupuis was educated at Collège de Varennes in Longeuil, Quebec, and worked as an insurance agent and as the owner of two music stores prior to running for elected office.

[2] He was accused of accepting a bribe related to the licensing of a new race track in his riding, and resigned from the cabinet on January 22, 1965.

[6] He resigned as leader of his new party on October 21, 1974, and announced the end of his political career.

He was replaced as leader by Yvon Brochu,[7] who merged the party with the Union Nationale on May 31, 1975.

He was the president of Publivox Inc., and owner of Agence de Voyages Yvon Dupuis Inc. from 1981 to 2003.