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Born Sept. 29, 1863, in Allenstein; died Nov. 17, 1919, in Berlin. German Social Democratic leader; a centrist.
From 1911 to 1917, Haase was one of the chairmen of the Social Democratic Party. He was a deputy to the Reichstag (1897-1907, 1912-18). On Aug. 4, 1914, Haase spoke in the Reichstag to justify the Social Democratic Party’s voting for war credits. In April 1917, with K. Kautsky and other centrist leaders, he organized the Independent Socialist Party of Germany. At the time of the November Revolution of 1918 he and F. Ebert were cochairmen of the provisional government—the Council of People’s Representatives; he cooperated in putting down the revolutionary movement of the proletariat.