Matthew Avery Modine is an American actor. He rose to prominence through his role as U.S. Marine Private/Sergeant J.T. "Joker" Davis in Stanley Kubrick's Full Metal Jacket (1987). Other films include Birdy (1984), Vision Quest (1985), Married to the Mob (1988), Gross Anatomy (1989), Pacific Heights (1990), Short Cuts (1993), Cutthroat Island (1995), The Dark Knight Rises (2012), and Oppenheimer (2023). On television, he portrayed Dr. Don Francis in the HBO film And the Band Played On (1993), the oversexed Sullivan Groff on Weeds (2007), Ivan Turing in Proof (2015), and Dr. Martin Brenner in Netflix's Stranger Things (2016–2022).