Justin Drew Tranter is an American songwriter, singer, and activist. Tranter has written songs for artists such as Britney Spears, Gwen Stefani, Linkin Park, Kelly Clarkson, Sara Bareilles, Selena Gomez, Justin Bieber, DNCE, Citizen Queen, Kesha, Imagine Dragons, Cynthia Erivo, The Knocks, Fifth Harmony, 5 Seconds of Summer, Chappell Roan, Halsey, Ariana Grande, Lady Gaga, Raye, Bea Miller, Demi Lovato, Dua Lipa, Måneskin, and Fall Out Boy.