One of the greatest masters of German expressionism is Karl Schmidt-Rottluff (1884-1976). He added the Rottluff - the place he was born - to his name in 1905 when he co-founded the artists group Die Bruecke (The bridge) in Dresden, together with Kirchner, Bleyl and Heckel. Unavoidably, his art was discredited in Nazi Germany in the thirties, when many of his works were seized in the campaign against degenerate art. I have seen the original of the 1919 painting I selected for this post in the Buchheim Museum for Expressionism in Germany. More on Schmidt-Rottluff in the wikipedia article linked to below.