Kieran Kyle Culkin (born September 30, 1982) is an American film, television, and theatre actor. Brother of actors Macaulay and Rory, he began his career as a child in the 1990s and achieved his breakthrough with Igby Goes Down (2002). Notable roles of his are Wallace Wells in Scott Pilgrim vs The World (2010), Roman Roy in HBO tragicomedy Succession (2018-2023), and Benji in A Real Pain (2024). His accolades include a Golden Globe Award, a Primetime Emmy Award, and an Academy Award.