Geller performed regularly in Germany and abroad as a soloist at festivals and clubs in various formations including some big bands as well as with such diverse artists as Knut Kiesewetter, Lennie Niehaus, Jiggs Whigham, Rolf Kühn, Slide Hampton, Buddy DeFranco, Lew Soloff, Charlie Mariano and Jan Lundgren.
He also arranged music for other German artists such as German folk/pop singer Knut Kiesewetter.
Knut Hamsun | Knut Wicksell | Knut Hamre | Knut Buen | Knut | Knut Schreiner | Knut Posse | Knut Kiesewetter | Knut Haavik | Knut Haakonsson | Knut Gjerset | Knut Anders Fostervold | Knut Vollebæk | Knut Værnes | Knut Storberget | Knut Seip | Knut Reiersrud | Knut Lystad | Knut Lundmark | Knut Kloster | Knut Johannesen | Knut Holmann | Knut Helle | Knut Haug | Knut Hamsun's | Knut Frydenlund | Knut Frænkel | Knut Erik Jensen | Knut Brynildsen | Knut Bergsland |