Efrim Manuel Menuck (born 1970) is a Canadian musician involved in a number of Montreal-based groups, most notably Godspeed You! Black Emperor and Thee Silver Mt. Zion Memorial Orchestra . Menuck is also a frequent record producer, working with musicians from Montreal and abroad. Just the facts: born 1970 in Montreal, Quebec. son of a doctor and a nurse. mother left in 1973. came back briefly 17 years later, and then left again. hebrew day school from grades 1 through 9.