Wollny performs solo and also as leader of a trio with Eva Kruse (bass) and Eric Schaefer (drums). This trio, named [em], has attracted considerable attention in Germany and has also led to critical praise in Italy, Scandinavia, the UK and Eire. Among compositions played by [em] are ‘Another Mr Lizard’, ‘Bells’ and ‘Takashi’ by Wollny, ‘Schneefall’ and ‘Brizzle’ by Kruse, and ‘Phlegma Phighter’, ‘Gorilla Biscuits’ and ‘Funebre’ by Schaefer. Wollny has also played in groups led by trombonist Bob Brookmeyer and has recorded in duo with veteran German free jazz saxophonist Heinz Sauer, with whom, in addition to original works, he plays music by composers as diverse as Björk, Billy Strayhorn, Thelonious Monk and Gil Evans.
In 2007, Wollny won the Jazzpreis der Nürnberger Nachrichten and [em] was named as Most Promising International Newcomer Of The Year at the Ronnie Scott Jazz Awards. The trio was recorded live at the Vortex, London, in May 2007.