Mark Beasom has been singing with LA Opera since 1986, appearing in over 100 productions with the company.

He has been a member of the Los Angeles Master Chorale since 1983. He has performed with I Cantori, Los Angeles Chamber Singers, Early Music Ensemble of Los Angeles and Musica Angelica Baroque Orchestra, and he is a soloist with Pasadena Pro Musica. He has sung in many film soundtracks and on a number of recordings.