Stephen Hartley Dorff Jr. (born July 29, 1973) is an American actor, known for portraying Roland West in the third season of HBO's crime drama anthology series True Detective, PK in The Power of One, Stuart Sutcliffe in Backbeat, Johnny Marco in Sofia Coppola's Somewhere, Glen in The Gate, and for his roles in Cecil B. DeMented, The Motel Life, S.F.W., Space Truckers, and Blade as vampire-overlord Deacon Frost.
Dorff was born in Atlanta, Georgia, the son of Nancy and Steve Dorff, who is a composer and music producer. His father is Jewish, and his mother was Catholic, and Dorff has stated that he was "kinda brought up half-Jewish." Dorff's brother Andrew (1976–2016) was a country music songwriter. He was raised in Los Angeles, where his father worked, and began acting as a child, appearing in commercials for Kraft and Mattel. Dorff attended several private schools, and was expelled from five of them.