Career
Diefenbach was a pioneer of nudism and the peace movement. His country commune, Himmelhof, in Ober Sankt Veit near Vienna (1897–1899) was one of the models for the reform settlement Monte Verità in Ascona. When his commune went bankrupt, he moved to Capri and stayed there for the rest of his life.
As a painter, Diefenbach was an independent representative of Symbolism.
October 29, 2009 to January 31, 2010: Museum Villa Stuck in Munich.