He has written numerous biographies of France's great queens, all published by Editions Pygmalion.
His most celebrated books, L'affaire Louis XVII (Tallandier, 1995, 2000) and Louis XVII : la vérité (Pygmalion, 2000) have attracted intense interest from the public and the media due to their groundbreaking analyses of DNA research on a human heart long-supposed to be that of Louis XVII, dead in Temple Tower, Paris, in 1795.