Sadler was born in
Hackney, London and educated at the
University of Oxford (B.A., 1908; M.A., 1911). He also taught at the
Royal Military College of Australia. and, when in 1936 the latter was appointed the first head of the Department of Old Testament Language and Literature at the University of Sydney, one of four departments offering courses for the new Bachelorate of Divinity there, Sadler assisted in lecturing duties and in other ways. After retirement from the University of Sydney (his successors in the professorship being John Kennedy Rideout in 1948 Sadler returned to
England and settled in the
Essex village of
Great Bardfield. At Bardfield he became friendly with several of the
Great Bardfield Artists. He spent his final years living in Stubbards Croft in Great Bardfield and later at Buck's House in the same village. ==Personal life==