German Expressionist artist and art expert in many disciplines, broadly acknowledged as one of the most important discoverers and promoters of German avant-garde art in the early twentieth century (Expressionism, Futurism, Dadaism, Magic Realism).
He discovered, sponsored and promoted many young, still unknown artists of different styles and trends, such as the Blaue Reiter and Italian Futurism. Later some of them became very famous, among others: Oskar Kokoschka, Maria Uhden, Georg Schrimpf. He also discovered and promoted several poets, notably August Stramm, Otto Nebel, and Franz Richard Behrens. The literary style he espoused became known as ‘Wort-Kunst’ (Word-Art).
From 1901 to 1911 Walden was married to Else Lasker-Schüler, the leading female representative of German Expressionist poetry. She invented for him the pseudonym “Herwarth Walden”, inspired by Henry Thoreau’s novel Walden, or Life in the Woods (1854). In 1912 he married Swedish painter Nell Roslund. In 1919 he became a member of the Communist Party. In 1924 he was divorced from his second wife.
With the economic depression of the 1930s and the subsequent rise of National Socialism, his activities were compromised. In 1932 he married again and left Germany shortly later because of the threat of the Gestapo. He went to Moscow, where he worked as a teacher and publisher. His sympathies for the avant-garde soon aroused the suspicion of the Stalinist Soviet government, and he had to repeatedly defend against the equation of avant-garde and fascism. Walden died on 31 October 1941 in a Soviet prison in Saratov.

Link to Wikipedia biography