Essex was ordained deacon in May 1910 by Bishop
Sidney Catlin Partridge and priest on June 11, 1911, by Bishop
David H. Greer of New York. Essex married Charlotte Josephine Nason on June 11, 1914. He was curate at
Trinity Church,
Newport, Rhode Island from 1910 till 1913, and then rector of St Peter's Church in
St. Louis,
Missouri from 1913 till 1917. In 1918 he became rector of Trinity Church in
Rock Island, Illinois, while in 1925 became rector of
St Paul's Church in
Peoria, Illinois, where he remained till 1936. ==Episcopate==