German Social Democratic politician who, without party or government authorization, on Nov. 9, 1918, made the Weimar Republic a fact by proclaiming it from the balcony of the Reichstag. He later became the republic’s first chancellor.
A journalist and (from 1903) member of the Reichstag for the Social Democrats, Scheidemann joined the majority of his party in supporting Germany’s participation in World War I. Toward the war’s end, he was appointed minister without portfolio in the last imperial cabinet (October 1918). Although the Social Democrats had planned to support a constitutional monarchy in Germany, Scheidemann’s proclamation of a republic, made in the face of leftist uprisings, was irreversible. From November 1918 to February 1919 he served on the six-member ruling council of the interim republican government. After serving as first chancellor (February–June 1919) of the Weimar Republic, he resigned rather than give his assent to the Versailles Treaty. Serving subsequently as mayor of Kassel (1920–25), Scheidemann maintained an outspoken opposition to all government attempts at accommodation with the military and with reactionary parties. In 1922 an attempt to assassinate him miscarried. He emigrated from Germany at the beginning of the National Socialist period (1933)
He died 29 November 1939, Copenhagen.

Link to Wikipedia biography