In Berlin, he appeared on the scenes with many musicians such as Tal Farlow, Herb Ellis, Barry Guy, Axel Dörner, Mal Waldron, Paul Lovens, Zeena Parkins, Keith Tippett, Butch Morris, Ulrich Gumpert, Evan Parker, Aki Takase, Mats Gustafsson, Alexander von Schlippenbach, Joëlle Léandre, David Liebman, Conny Bauer, Johannes Bauer, Andrea Neumann, Chris Dahlgren, Frank Gratkowski, Phil Minton and Tony Buck.

With the duet Kimmo Elomaa and with the Live-Elektroniker Jayrope, he was awarded the prize Senate of Berlin in 2001.

At present, he plays in Ulrich Gumpert's quartet, Baby Bonk, and his own trio Themore 3, TGW (with Christian Weber and Michael Thieke), in Lacy Pool and in a duet with Ernst-Ludwig Petrowsky.

[2] Griener made tours in many European countries and also in Turkey, Israel, Morocco and the USA.

In November 2008, he was appointed honorary professor of the Hochschule für Music Carl Maria von Weber.