[1][2] A member of the troupe of the Opéra Garnier from 1933, he distinguished himself particularly in the roles of : The Magic Flute (Sarastro), Samson et Dalila (the old Hebrew man), Aida (Ramfis), Rigoletto (Sparafucile), La Juive (Cardinal de Brogni), Les Huguenots (Marcel), Die Entführung aus dem Serail (Osmin), Boris Godunov (Pimen, Varlaam), Die Walküre (Hunding), and Der Rosenkavalier (Baron Ochs).
[3] Medus was born in Guelma (Algeria) where he spent his childhood before his family settled in Algiers.
He took singing lessons from Rose Elsie (soprano of the Opéra-Comique) After an audition for conductor Désiré-Émile Inghelbrecht (1880–1965), then musical director of the Algiers Opera, he was hired for the role of Colline in La Bohème.
After two seasons of experience in a multitude of roles, he moved to Paris and was hired as a chorister at the Théâtre du Châtelet.
He appeared in world premieres in works by Reynaldo Hahn, Max d'Ollone, Henri Rabaud, and Gilbert Bécaud.