Isaac Landman (1880–1946), born in Sudylkiv, Ukraine, was a scholar and Reform movement rabbi in the United States. In 1890, together with his parents, he emigrated to the United States. He graduated from Hebrew Union College and in 1911, he founded a Jewish farm colony in Utah (with the assistance of Jacob Schiff, Julius Rosenwald, and Simon Bamberger). During World War Ⅰ he served as a chaplain for US Army in Europe. He was a leader in Jewish–Christian interfaith ecumenism. He was editor of American Hebrew Magazine from 1918, served as the delegate of the Union of American Hebrew Congregations to the 1919 Paris Peace Conference. An outspoken opponent of Zionism, in 1922, while the United States Congress was considering the Lodge–Fish resolution in support of the Balfour Declaration, Rabbi Landman and Rabbi David Philipson presented the Reform movement's (then) anti-Zionist position to the House Committee on Foreign Affairs. He also printed many opinions against the resolution and Zionism in American Hebrew Magazine. He became rabbi of Congregation Beth Elohim (Brooklyn, New York) in 1931. Three years later he began editing the Universal Jewish Encyclopedia, which was published in ten volumes in the 1940s.