Career
He has authored and edited a number of books and papers on engineering and historical topics. He remains one of the preeminent historians on Jewish history in British Columbia. In 1971 Leonoff became the founding president of the Jewish Historical Society of British Columbia.
In 2007, the Cyril Leonoff Fund for the Jewish Historical Society of British Columbia was established.
Cyril East. Leonoff was born in Winnipeg, Manitoba, in 1925. He is the grandson of Edel Brotman, a homesteader and rabbi of the Wapella, Saskatchewan, farm colony, 1889–1906.
Leonoff, Cyril East. The Rise of Jewish Life and Religion in British Columbia, 1858-1948.
Winnipeg: 2008
Leonoff, Cyril East. Bridges of Light: Otto Landauer of Leonard Frank Photos, 1945-1980.
Vancouver: 1997
Leonoff, Cyril East. A Dedicated Team: Klohn Leonoff Consulting Engineers 1951-1991. Vancouver: 1994
Leonoff, Cyril East.
An Enterprising Life: Leonard Frank Photographs 1895-1944. Vancouver: 1990
Leonoff, Cyril East. Pioneers, Pedlars and Prayer Shawls: The Jewish Communities in British Columbia and the Yukon.
Victoria: 1978.