Marton was born in Invercargill, Aotearoa (New Zealand), to Margaret Christine (Rayner), a nurse, and Márton Csókás, a mechanical engineer. His father is Hungarian and his mother is Australian (of English, Irish, and Danish origin). He inherited some of his talents from his father, who was also a trained opera singer and at one time, a trapeze artist in the Hungarian Circus.
His academic training began at Canterbury University, Christchurch, New Zealand, where he commenced a Bachelor of Arts degree, majoring in Art History, and then transferred to, Te Kura Toi Whakaari o Aotearoa/ The New Zealand Drama School, graduating in December, 1989. His first acting role was in Te Whanau a Tuanui Jones by Apairana Taylor at the Taki Rua Theatre in Wellington New Zealand, (1990). He has since had an eclectic career of theatre, television and film.
He appeared in the 1994 movie Jack Brown Genius (1996) in which he played the role of Dennis. After starring for two years in the New Zealand soap opera Shortland Street (1992), he starred in the 1996 movie Broken English (1996) as Darko. After performing in a great number of theatrical plays, writing his own and co-founding his own theatre company, the Stronghold Theatre, Marton got the role of Tarlus in an episode of Hercules: The Legendary Journeys (1995). After that, he continued working with Renaissance Pictures, playing the roles of Khrafstar and Borias in the 1997-1998 seasons of Xena: Warrior Princess (1995). He continued appearing in many other shows in both NZ and Australia, such as Farscape (1999), BeastMaster (1999), Water Rats (1996), Cleopatra 2525 (2000), and more, returning for the role of Borias in three episodes of the 2000-2001 season of Xena: Warrior Princess (1995). He was also in many movies produced in NZ and Australia, such as Hurrah (1998), The Monkey's Mask (2000) and the mini-series The Farm (2001). He is a citizen of the European Union and Hungary, and is a permanent resident of the United States.
Most recently, Csokas starred opposite Denzel Washington in Sony's hit film The Equalizer. He played a brutal fixer for the Russian mafia and a formidable villain to Washington's reluctant hero.
Csokas appeared in Darren Aronofsky's Noah as well as Robert Rodriguez's Sin City: A Dame to Kill For, a sequel to the 2005 hit film Sin City. Csokas also played the psychiatrist, "Dr. Kafka," in the hit movie sequel, The Amazing Spiderman 2, alongside Andrew Garfield, Emma Stone and Jamie Foxx.
Csokas most famously starred as "Lord Celeborn" in one of the highest-grossing film series of all time, Peter Jackson's Lord of the Rings trilogy. Some of his other film credits include 2010's The Debt opposite Jessica Chastain and Paul Greengrass' The Bourne Supremacy with Matt Damon. His depth of experience is illustrated in Asylum in which he starred opposite Natasha Richardson and Ian McKellen, as well as the Ridley Scott epic, Kingdom of Heaven, with Jeremy Irons, Brendan Gleeson and Liam Neeson.
On the small screen, Csokas recently starred on the History Channel's miniseries Sons of Liberty as well as Discovery Channel's miniseries Klondike with Tim Roth and Sam Shepard.
On stage, Csokas continues to work internationally, most recently starring in a production of Lillian Hellman's "Little Foxes" at The New York Theatre Workshop by acclaimed director, Ivo van Hove. The play was noted by Time Magazine as one of the "Top 10 of Everything of 2010." The actor has numerous classical credits, including 'Orsino' in Shakespeare's "Twelfth Night" at the National Theatre of Great Britain, 'Anthony' in "Anthony and Cleopatra" at the Theatre of a New Audience, 'Brutus' in "Julius Caesar" and as 'Septimus' in Tom Stoppard's "Arcadia" in his birthplace of New Zealand. On the Australian stage, Csokas has appeared as 'George' in "Who's Afraid of Virginia Woolf," directed by Benedict Andrews of the Schaubuhne Theatre in Berlin and in "Riflemind," directed by Phillip Seymour Hoffman at the Sydney Theatre Company.More