Werner Graeff (also Gräff; 24 August 24, 1901, Wuppertal – 29 August 29, 1978, Blacksburg, Virginia) was a German sculptor, painter, graphic artist, photographer, film maker and inventor. In 1921 he started studying at the Bauhaus in Weimar. Here he soon became under the influence of Theo van Doesburg, and participated in a meeting in Weimar in May 1922 where van Doesberg, El Lissitzky and Hans Richter planned the intervention of the International Constructivist Faction at the International Congress of Progressive Artists held in Düsseldorf, 29–31 May 1922. Source: Wikipedia (en)