Mark Philipp Wirtz (3 September 19437 August 2020) was a French pop music record producer, composer, singer, musician, author, and comedian. Wirtz was best known for the never-completed "A Teenage Opera" concept album. The first single from the planned album, "Excerpt from A Teenage Opera" by Keith West, was a number 2 hit on the UK Singles Chart in September 1967. He was born in Strasbourg, France.