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).