How many movies have Christoph Hübner and Hans-Dieter Grabe collaborated on?

They have worked on 1 movie together! Their first movie together was Documentary filmmaking: Christoph Hübner talks with Hans-Dieter Grabe (1998) and was their highest rated movie together. They have not worked together since Documentary filmmaking: Christoph Hübner talks with Hans-Dieter Grabe (1998).