Mathias is educated as a choir conductor at the Ljungskile folk high school and at the Academy of Music and Drama in Gothenburg. He has conducted the Chalmers Men's Choir since 2004. Apart from the Men's Choir he also conducts the choir Unikorus and the Academic Choir and from time to time also some orchestras. Choir singing has been his interest since he was young. Already at the age of seven Mathias sang in the Gothenburg Boy's Choir. Today he sings as a tenor in the Swedish Chamber Choir since 1998.