 A payor at the Treasure (1806), Royal censor (1820-1824), director of the mayors' newspaper (1822-1824), literary critic by the "Moniteur universel et officiel", director and chief curator of the bibliothèque de l'Arsenal, then librarian at the Senate in 1854, where he succeeded Paul-Mathieu Laurent, Vieillard began early in the dramatic career.He produced no less than 30 plays, 24 of which were presented in different theaters, such as the Opéra, the Opéra-Comique, the Théâtre-Français and the Théâtre du Vaudeville.The verve he spent in these various works, where he worked with Armand Gouffé, Georges Duval, René de Chazet, Dumersan, Jules Merle and Joseph Pain, did not prevent him to exploit the literary criticism which asked for more seriousness and a more complete maturity of mind on his part.