Aristide Demonico received classical training as an actor. Julien Bertheau and Denis d'Inès were his masters. During the 60s, he participated in some of the adventures of the theatrically effervescent Parisian suburbs: Part of the team of the Théâtre Gérard Philipe de Saint Denis at its creation, the Amandiers festivals in Nanterre with Pierre Débauche and d ' Aubervilliers with Gabriel Garran, West Parisian Theater.

He works under the direction of Julien Bertheau (of which he is the assistant), José Valverde, Edmond Tamiz, Georges Goubert, Stéphane Ariel; plays Arthur Adamov, Oliver Goldsmith, Scan O'Casey, Gorki, Marivaux, Molière, Shakespeare.