Before his jump to politics he was the general manager of the "Association des Hopitaux du Quebec".
Marcoux won in the 1998 elections the Vaudreuil seat which was formerly held by Daniel Johnson Jr.
former Quebec Premier.
Marcoux was named Transport Minister in 2003 before being promoting to Justice Minister in a Cabinet shuffle in February 2005.
He was re-elected in the 2007 elections for a third term but was not named in the new cabinet.
Jacques P.
Dupuis, who was the Minister of Public Safety, was appointed to the portfolio of Minister of Justice.
Marcoux is married and has four children and five grandchildren.