Jörgensmann was born in 1948 in the town of Bottrop in the Western Rhur industrial region of Germany. His work with the 'Bottrop Sextet' reveals that he continues to retain great affection for the town where he grew up. In the middle of the sixties he worked as a laboratory technician in a chemical laboratory. He started to play clarinet at the age of 18, taking private lessons from a music teacher at Folkwang Academy of Music in Essen. His dedication to the clarinet as his only instrument was only briefly interrupted during a 15 month spell doing National Service, when he was asked to play soprano saxophone for the Army dance band. After the phase in the German Army, Jörgensmann worked with handicapped children and studied several of semesters social pedagogics and computer science. Theo Jörgensmann is one of the most advanced modern free improvisers on his instrument, combining moody chamber jazz with hints of a modal hard bop sensibility. The distinctive tonal quality of Jörgenmann’s playing owes something to his choice of clarinet. Many of his albums, available on hatOLOGY, were recorded using a straight basset clarinet in Bb, made by Harald Hüyng, a pupil of the great Herbert Wurlitzer. This clarinet, although an Oehler System, would have some essential similarities to that played by Stadler when playing the Mozart Clarinet Concerto in the 1780’s. It has extended keywork to enable an additional D and C at the bottom of its range. In 2008, however, Jörgensmann switched from his basset clarinet in Bb to a Low G clarinet, built by another pupil of Herbert Wurlitzer, Wolfgand Dietz. The special sound of his playing arises from the fact that Jörgensmann blows with less pressing of the teeth. As a result, he can play other phrasing and accents, as it is usually possible on the clarinet. It is thus more closely related with the 'hard bop' saxophonists. Jörgensmann made his first appearance at a major event as a member of the 'Contact Trio' with Michael Jullich at the 1972 Frankfurt Jazz Festival. During this period he began working with local musicians. He didn't become a professional musician until 1975. In the early 1970's Jörgensmann played in a Jazz Rock group which included the keyboard player Hendrik Schaper (later a member of Klaus Doldinger and Udo Lindenberg) and the drummer Udo Dahmen. At this time he used electronic effects pedals, such as fuzz, wah-wah and chorus. Probably he was one of the first clarinetists which electronically distorted their instrument. But by 1975 when he formed the clarinet ensemble, 'Clarinet Contrast', he was interested in the pure acoustic sound of his instrument. 'Clarinet Contrast' included Bernd Konrad, Hans Kumpf and Michel Pilz as well as one of the musicians Jörgensmann had most admired when he first began playing clarinet, Perry Robinson. In 1975 he also founded his first Quartet, which end of the seventies was one of the most successful jazz bands in Germany. In 1977 the 'Theo Jörgensmann Quartet' performed as German representative at the festival of the European Broadcasting Union in Hilversum, Netherlands. Jörgensmann's exclusive focus on the clarinet has led him to form a succession of partnerships with other clarinet players and because of its commitment to the clarinet he was part of the Renaissance in the jazz and improvised music scene. In 1979 the influential European producer and music journalist, Joachim-Ernst Berendt helped Jörgensmann call together the members of the 'Clarinet Summit'. This was an all-star clarinet group with soloists: John Carter, Perry Robinson, Theo Jörgensmann, Ernst-Ludwig Petrowsky and Gianluigi Trovesi. John Carter and Theo Jörgensmann met each other at the Moers Jazz Festival in 1979. There they performed solo and as a duo on three days. Eckard Koltermann is another clarinetist who Jörgensmann has collaborated with on many occasions. As well as working together as the 'German Clarinet Duo' , in the mid 1980's they were both regular members of the clarinet ensemble CL 4, along with Lajos Dudas, Dieter Kühr, Eckard Koltermann and Gerald Doecke.