Josa is a violinist and an experimental music-theater/sound-artist based in Berlin and Frankfurt a. M. He studied at Universität der Künste Berlin and at Hochschule für Musik und Darstellende Kunst Frankfurt a. M. Next to his violin-studies he is dedicated to exploring new possibilities of moving between music, theater and visual art.

Josa plays in different chamber-music ensembles, the Andromeda Mega Express Orchestra and as a musician and performer participated in a number music-theater productions, e.g. for Konzerthaus Berlin, Schauspiel Hannover, Staatsoper Stuttgart, Opernfestspiele München, Nationaltheater Mannheim.