Geoff Berner (born 26 November 1971) is a Canadian singer-songwriter and accordionist. Predominantly a composer and performer of klezmer music, having proclaimed himself the "Avenging Angel of Klezmer", Berner's darkly humorous, insightful and satirical lyrics, as well as his cabaret live act, have gained him considerable underground acclaim and popularity throughout the world. He is often accompanied by Diona Davies on violin and Wayne Adams on drums. Frequent collaborators include Dan bern, Carolyn Mark, and The Corb Lund Band.