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He was chairman of the board of Tiberius Hot Springs, Ltd. (1935–40), president of both the Jewish National Fund (1923–37) and the Keren Hayesod of America (1941–46), and vice–president of the Zionist Organization of America (1927–48). Rosenblatt wrote: Two Generations of Zionism (1967), his autobiography; Social Zionism (1919); Federated Palestine and the Jewish Commonwealth (1941); and The American Bridge to the Israel Commonwealth (1959).