Sadoul followed the career of Giraud closely from the mid 1970s onward until the latter's death in 2012, conducting extensive interviews with the artist throughout this period of time, which resulted in three consecutive interview books, Mister MĆbius et Docteur Gir (1976), MĆbius: Entretiens avec Numa Sadoul (1991), and Docteur MĆbius et Mister Gir (2015), the latter two being each an updated and expanded version of the previous one.
Excepting parts of the first book (in SCHTROUMPF: Les cahiers de la BD, issue 25, July 1974), none of the later interviews had seen prior magazine publication, be it in part or in whole.
The last version therefore was an posthumous account where the last two decades of Giraud's life were concerned.
As a kid, Sadoul was as fascinated by the stage as he was by comics.
Since then, as head of his troupe Les Enfants Terribles, he has filled every position connected with the stage: actor, director, author, stage manager, and drama teacher, in addition to head of a theater school for children and teens in a town on the French Riviera.
Later, in the 1960s and 1970s, his passion for the stage combined with that for vocal music would lead Sadoul to become an opera critic, before integrating the trade in 1977 as a full-blown opera director; he has been invited to produce operas and plays alike on the most prestigious stages in France, from Lille and Bordeaux to Nice and Marseille.
This part of his life is recounted in the 2016 book "Forty Years at the Opera, Egodictionnaire de l'art lyrique".