Chaim Azriel Weizmann was an Israeli statesman, biochemist, and Zionist leader who served as president of the Zionist Organization and later as the first president of Israel. He was elected on 16 February 1949, and served until his death in 1952. Weizmann was instrumental in obtaining the Balfour Declaration of 1917 and convincing the United States government to recognize the newly formed State of Israel in 1948.