Between 1978 and 1997, he was a member of the French National Assembly. From 1993 until 1995, he was the Minister of Civil Service. He is an officer of the Légion d'honneur and an honorary member of the Académie de Stanislas.
Rossinot, currently the president of the Urban Community of Nancy, is the former mayor of Nancy (Meurthe-et-Moselle) and honorary president of the Radical Party. He was president of the party at different points in the 1980s, 1990s and 2000s, before and after it aligned with the UMP.