A key leader in the formulation and diplomacy of Zionism, Weizmann is a chemist by profession and the diplomatic linch-pin for securing the 1917 Balfour Declaration. He leads the World Zionist Organization and in diplomatic missions abroad, all aimed at securing international support for Zionism and the Jewish state. In 1949, he becomes Israel’s first President, holding the position until he dies on November 9, 1952.