Thomas Holmes has conducted Cantus Novus Wien since 2001. At the age of five, he started to learn the violin, and received his first piano lessons as a member of the Vienna Boys Choir. He continued his studies in Church Music at the Universität für Musik und darstellende Kunst Wien, with an emphasis on choral conducting, organ, liturgical organ improvisation, Gregorian chant and music education.
For many years, Holmes was a singer in the Arnold Schoenberg Choir, as well as organist and harpsichordist of the Vindobona Baroque Ensemble. From 1994 to 2005 he was artistic leader of the Gregorian Chant Schola of the Vienna Imperial Chapel. He has also worked as recording manager of choral music and Gregorian chant for Philips Classics among others, and has taken part in both national and international concerts, as well as in audio recordings as a singer, pianist and choirmaster. Furthermore, he has served as a professor at the Konservatorium für Kirchenmusik der Erzdiözese Wien.
Holmes is a lecturer on choral conducting and Gregorian chant, and regularly hosts radio programmes dedicated to sacred music.