March 13, 1840, Boston, Massachusetts.
December 15, 1923, Rochester, New York.
Mount Hope Cemetery, Rochester, New York.
William was the son of Ezra Stiles Gannett and Anna Linzee Tilden, and husband of Mary Thorn Lewis.
He was educated at Harvard University (BA 1860, MA 1863). After the American civil war, he spent three years working with freed slaves in Port Royal, South Carolina. Afterward, he toured Europe (1865–56), then returned to Harvard, graduated from its Divinity School, and became a Unitarian minister in 1868.
He served in Milwaukee, Wisconsin (1868–70); East Lexington, Massachusetts (1871–72); St. Paul, Minnesota (1877–83); Hinsdale, Illinois (1887–88); and Rochester, New York (1889–1908). He was also a leader in the women’s suffrage movement, founded the Boys Evening Home association, and was active in many other causes. He helped edit Unity Hymns and Chorals, 1880. His other works include: