An American actor, director, and screenwriter, he is known for his collaborations with filmmaker Jeremy Saulnier. He gained recognition for his performance in "Blue Ruin" (2013), which was well-received at the Cannes Film Festival. His work often features themes of revenge and dark comedy. Transitioning to directing, he made his directorial debut with "I Don't Feel at Home in This World Anymore" (2017), winning the Grand Jury Prize at Sundance. His career spans both indie films and larger studio projects.