Rabbi Isaac S. Moses (1847–1926), born in Zaniemysl, Poznan, became a Reform rabbi in the United States in the early 1870s. He was appointed to rabbinic positions in Quincy, Illinois (1876), Milwaukee (1879), and Chicago (1888). In 1901 he became rabbi of the Central Synagogue, New York, where he remained until his retirement in 1919. In his early days in the United States, Moses was considered a radical Reformer, but later he took a more moderate position. In 1884 he introduced his own prayer book (Tefillat Yisrael). Moses was a founding member of the Central Conference of American Rabbis and a member of the Reform committee charged with compiling an official prayer book.