After the war he returned to Germany, living in a small cottage on the Achalm, and concentrated on doing large-scale woodcuts and posters.
Between 1955 and 1960 he taught at the Kunstakademie (Academy of Fine Arts) in Karlsruhe as successor to Erich Heckel.
[2] Grieshaber was a long-time pacifist and political activist, not only against the dictatorships in Greece and Chile, but also in the area of conservation and ecology, against nuclear plants, and in favour of a bridging between the two Germanies.
Grieshaber's daughter, Nani Croze, founded a stained glass workshop on the Athi-Kapiti plains adjacent to the Nairobi National Park.
[citation needed] He took a stab at industrial design in the 1970s with a 500-piece run of the upscale Suomi tableware by Timo Sarpaneva that Grieshaber decorated for the German Rosenthal porcelain maker's Studio Linie.