Hayley Gene Penner (born November 5, 1985) is a Canadian singer, songwriter and author based in Los Angeles. She is best known for the songs she has written for artists including The Chicks, Sabrina Claudio, Lennon Stella, Charlotte Lawrence and The Chainsmokers. As of 2018, Penner has been releasing music under her full name and in September 2020, she released her debut album, People You Follow, with a memoir of the same name.