"Mark Wirtz"@en . "Mark P. Wirtz born (September 3, 1943, Strasbourg, France) is an Alsatian pop music record producer, composer, singer, musician, author, and comedian. As a producer, Wirtz's most famous output is from the mid to late 1960s, when he worked at Abbey Road Studios with Beatles engineer Geoff Emerick, under contract to EMI. Wirtz is chiefly known for the never-completed A Teenage Opera concept album."@en . . . "Wirtz, Mark"@en . "1943-09-03Z"^^ . "French record producer" . "1943Z"^^ . . . .