An
Anglo-Catholic, Keating helped establish the
Church of the Atonement in the developing
Edgewater neighborhood of Chicago, which prompted him to leave his legal practice. After ordination both as a deacon and priest by bishop
William Edward McLaren of Chicago in 1891, Rev. Keator served as the mission congregation's first priest-in-charge until 1896, shortly before it achieved full parish status. He then served congregations in
Freeport, Illinois, until 1898, and at St. John's Church in
Dubuque, Iowa, from 1899 to 1902. He was consecrated in the episcopacy on January 8, 1902, by Presiding Bishop
William Hobart Hare (former missionary bishop of South Dakota), as well as by Chicago bishop McLaren, bishop
Cyrus F. Knight of
Milwaukee, and bishops Nicholson, White, Edsall, Morrison, A. Williams, Anderson and Taylor. Assigned to Washington, Rt. Rev. Keator reached his diocese on January 25 and soon established his residence in
Tacoma. He served as the third Missionary Bishop of Washington State from 1902 until 1910, when the missionary district achieved full diocesan status (as well as a name change to distinguish it from not only the
Episcopal Diocese of Spokane but also the diocese encompassing the
national capital). Among his various civic activities in Washington, Bishop Keator served as president of the
Tacoma Public Library board from 1907 to 1910 and also 1912 to 1923. He also served on the boards of the
Annie Wright Seminary,
Whitman College in
Walla Walla, and
Tacoma General Hospital. Bishop Keator also served as the chaplain of the local Coast Guard Artillery Corps and the Washington State National Guard, and was a member of the Executive Council of the Episcopal Church (representing the Pacific region). Rt. Rev. Keator became the first Bishop of Olympia upon its formation in 1910, and served until his death on January 31, 1924. The following year, Rev.
Simeon Arthur Huston was elected to succeed him and was duly consecrated, and would move the diocesan seat to
Seattle. ==Death and legacy==