 In company with the music-scientist Rolf-Dieter Weyer, Jörgensmann wrote a philosophical book about improvising in music.In 1997 he started the Theo Jörgensmann Quartet, which toured in North America in 1999, 2001, and 2003, including playing twice at Montreal International Jazz Festival (1999 and 2003).In addition he has played with the Polish twins Marcin Oles and Bartlomiej Oles since 2003.