They both attended Barrington High School (Barrington, Rhode Island) for a period of time in the early 1990s. He attended the National Theater Institute in Waterford, Connecticut and then went on to earn his Master"s in Fine Arts from New York University"s Graduate Acting Program at the Tisch School of the Arts.
He is known for his roles in the television series 24, The O.C., Traveler, and Dark Blue, and as Charlie Holloway in the 2012 Ridley Scott film Prometheus. He has a twin brother named Taylor. Marshall-Green did his undergraduate studies at the University of Tennessee, Knoxville, where he also wrote for the school newspaper, The Daily Beacon, as an entertainment writer covering the bar, music, and theater scene.
Marshall-Green appeared in both Law & Order: Special Victims Unit in 2003 and Law & Order in 2004, before landing recurring roles on Fox"s The O.C. and 24.
In 2005 he performed in three separate productions: in June he played an anthropomorphic shark in Adam Bock"s Swimming in the Shallows. In August he appeared as Bo Decker in a production of William Inge"s classic Business Stop.
And in December he was Beethoven in the Peanuts spoof Dog Sees God: Confessions of a Teenage Blockhead. In 2007, he was cast as the villainous Edmund in the Public Theater production of King Lear starring Kevin Kline in the title role and directed by James Lapine.
That same year he also appeared in the Miramax film The Great Raid.
Marshall-Green portrayed Tyler Fog in the 2007 American Broadcasting Company series Traveler. He appeared as Paco in the 2007 film Across the Universe. Marshall-Green featured as Dean Bendis, an undercover police officer, in a black ops group of the LAPD headed by Dylan McDermott in the TNT series Dark Blue.
He also worked alongside Richard Gere, Ethan Hawke, Don Cheadle, and Wesley Snipes in the 2010 criminal drama Brooklyn"s Finest directed by Antoine Fuqua.
He played Melvin Panton, a young rookie cop who disagrees with the ways of Richard Gere"s character a soon to be retired cop Eddie. Marshall-Green played one of the leads in the Universal Pictures thriller film Devil.
He also portrayed with the role of Will, one of the leading roles in Karyn Kusama"s thriller The Invitation. Marshall-Green appeared in the Ridley Scott film Prometheus as Holloway, a crew member aboard Prometheus.