b. 21 March 1940, Karlsruhe, Germany. Joos studied flügelhorn, trumpet and bass, but also plays baritone-horn and alphorn. In the first half of the 70s he was a member of Modern Jazz Quintet, New Jazz Ensemble and the Fourmenonly group. During this period he also worked with different bands at Free Jazz Meeting in Baden-Baden, Free Jazz Day in Frankfurt and in a flügelhorn workshop together with Kenny Wheeler, Ian Carr, Harry Beckett and Ack van Rooyen. During the Blow project he collaborated with Bernd Konrad and Wolfgang Czelusta. He had also led his own quartet and orchestra. The most acknowledged of his assignments has been the one with the Vienna Art Orchestra. His warm and big tone and the romantic-impressionistic influences combined with the affinity of free improvisation gives him a strong and personal profile within the European jazz community.