(July 26, 1895 ?C April 25, 1949) was a Polish painter and printmaker. He was born as the seventh of ten children in Tuszyn, a suburb of Ł??dź. In 1912 he began training as an engraver with his uncle in Belgrade. He moved in 1914 to Germany where he lived for a time with his sister in Barmen. There he studied at the college of arts and crafts with professor Gustav Wiethecher. From 1918-1919 he went back to Ł??dź, where he was joint founder of a group of avant-garde artists. In 1920 he returned briefly to Berlin; in 1921 he returned to Barmen, and in 1922 he moved to Desseldorf. There he became a teacher at the Academy of Arts, and became acquainted with Paul Klee, who influenced his work. A painting by Adler received a gold medal at the exhibition German art Desseldorf in 1928. In 1929 and 1930 he went on study trips in Mallorca and other places in Spain. During the election campaign of July 1932 he published with a group of leftist artists and intellectuals an urgent appeal against the policy of the National Socialists and for communism. As a modern artist, and especially as a Jew, he faced persecution under Hitler's regime which took power in 1933.