William Rosenau (1865, Wollstein, Province of Posen, Prussia - 1943, United States) was a leader of Reform Judaism in the beginning of the twentieth century in the United States. Biography William Rosenau was born in Wolstein, Germany in 1865, the son of Rabbi Nathan and Johanna (Braun) Rosenau. The family came to the United States and settled in the Philadelphia area when William Rosenau was eleven. In 1876, Rosenau immigrated to the United States. He received a B.A. from the University of Cincinnati and a Ph.D from Johns Hopkins University. He also got rabbinic ordination from Hebrew Union College. He served as rabbi in Omaha, Nebraska and in Congregation Oheb Shalom of Baltimore, Maryland. He was also on the faculty of Johns Hopkins University. Rosenau was considered a "radical reformer" regarding ritual and he was a member of the anti-Zionist American Council for Judaism. He was an editor of the revised editions of the Union Prayer Book and the Union Haggadah. Much of Rosenau's early education was acquired from his father. The atmosphere of a rabbinic home no doubt influenced Rosenau's decision to enter the rabbinate. He studied at the University of Cincinnati and received his A.B. in 1888. In 1889 he became a rabbi after graduating from the Hebrew Union College in Cincinnati. In 1900 he received a Ph.D. from Johns Hopkins University in Baltimore, Maryland. In 1923 he received an honorary degree of Doctor of Hebrew law from the Hebrew Union College. After graduation from the seminary, Rosenau served at Temple Israel in Omaha, Nebraska from 1889 to 1892. He then received a call from Baltimore to become rabbi at Congregation Oheb Shalom. He served as active rabbi in Baltimore until 1939, when he became rabbi emeritus. In 1942 he completed his fiftieth consecutive year as rabbi of the congregation. While at Congregation Oheb Shalom he succeeded in the introduction of English prayers and sermons (from the previous German), the abolishment of the compulsory wearing of hats during services, and the introduction of the Friday evening service. He also served on the faculty of Johns Hopkins University in the Department of Semitics (1902-1932). Rosenau was involved in the activities of the general and Jewish communities of Baltimore. He was a member of the Baltimore School Board from 1900 to 1910 and served on the Maryland Society for the Study and Prevention of Tuberculosis. He was a member of