After studying History and Geography at the Sorbonne University, followed by Gregorian chant at the Ecole Cesar-Franck, Mario Hacquard enters the Paris National Music Conservatory. There, he wins several first medals and is admitted at the Ecole d'Art Lyrique of the Paris Opera with the unanimity of the jury. He receives the Prix Ravel and the Prix Jacques-Ibert at the International Competition of French Melody.

He has performed throughout Europe, in Japan and more recently in Algeria and Israel, in operas by Mozart, Haydn, Cimarosa, Rossini, Puccini, Massenet, Fauré, Britten and oratorios by Monteverdi, Bach, Haendel, Brahms, Mendelssohn, Berlioz, Saint-Saëns, Schönberg ...

He also leads the Ensemble vocal A REBOURS (medieval music) and directs operas.

Mario Hacquard founded the Music Festival of Chablis - Burgundy's Golden Gate, for which he is also Artistic Codirector.