Although his birth date is usually given as 1887, he changed it from 1889 to 1887 at the time of his marriage in 1912 so that his wife Marguerite, born in 1887, would not appear older than he. The 1889 birth date and the reason for the change have been verified by William Zorach’s sister, Ida Schoener of Cleveland. See also letter from William Zorach to Marguerite Thompson, December 7, 1911 at the Manuscript Division of the Library of Congress. The above information came from the publication, Marguerite Zorach: The Early Years, 1908-1920 Published for the National Collection of Fine Arts by the Smithsonian Institution Press, City of Washington, 1973, p. 58, note 14.