Lennie Gallant | Dave Niehaus | Lennie Weinrib | Lennie Tristano | Lennie James | Lennie Hayton | Jutta Niehaus | Charles Henry Niehaus | Steve Niehaus | Lennie Mayne | Lennie Bennett | Lennie Aleshire |
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 had no involvement in the Hair LP except for Kenton's name placed on the jacket cover; Ralph Carmichael and Lennie Niehaus were placed in charge of the project.