From 1989 to 1990 he attended a drama school, the Neighborhood Playhouse in New York. Martz has been involved in a number of family shows, including The Wicherts next door, practice Bülowbogen, Großstadtrevier, Unser Charly or The Country Doctor. For most series, he is now retired at his own request. Since the mid- 1990s, he is also seen in the theater. By the way Martz is the guitarist of the band lineup German girls and working among other things as acting coach and voice actor.