Mario Rojas is an alumnus of the prestigious Ryan Opera Center at the Lyric Opera of Chicago and an alumnus of the San Francisco Conservatory of Music.

Engagements in the 2024/25 season include: debut as Pinkerton/Madame Butterfly at the Hyogo Performing Arts Center in Japan, Nemorino at the Israeli Opera in Tel Aviv, debut as Don Jose/Carmen at the Estonian National Opera, and Duca of Mantua/Rigoletto at the Hannover Staatsoper.

In recent seasons Mario has sung roles such as Alfredo/La Traviata at the Opera National du Lorraine in Nancy, Rodolfo/La Boheme at the Luglio Musicale Trapanese and in Novara, and the debut as Ruggero in Puccini's La Rondine at the Teatro Regio Torino, Romeo in Gounod's Romeo and Juliet at the Fondazione Petruzzelli in Bari, Ismael in Verdi's Nabucco at the Castel de Peralada Music Festival conducted by Maestro Nicola Luisotti and the opera company of the Teatro Real in Madrid, Nemorino/L'elisir d'amore at the Teatro Massimo Bellini, Steva/Jenufa at the Opera National du Capitole in Toulouse.

Within his repertoire are characters such as Alfredo/La Traviata, a role that Mario debuted in 2019 at the Chicago Lyric Opera replacing a sick colleague at the last minute; Rodolfo in La Bohème; Rinuccio in Gianni Schicchi (debuted in 2021 at the Napa Valley Festival under the baton of Kent Nagano), Duca of Mantua in Rigoletto, Edgardo in Lucia di Lammermoor among others.

In 2019 he was invited to sing at Maestro Plácido Domingo's concert in his hometown, Torreón, Coahuila, in front of 30,000 people. Among the honors Rojas has received are the 2021 Maria Manetti Shrem Award from the Napa Valley Festival, William M. Sullivan Foundation Award in 2018, third place in the Dallas Opera Vocal Competition in the same year, and the Luminarts Foundation - Fellowship in 2020, as well as other recognitions.