Background
Cullen was born in Aberystwyth, Dyfed. He is the son of two writers and has two siblings.
Cullen was born in Aberystwyth, Dyfed. He is the son of two writers and has two siblings.
He spent his early years in Llandrindod Wells and moved to Cardiff at age 12, where he attended Llanishen High School. He graduated from the Royal Welsh College of Music and Drama in 2009 with First Class Honours degree in Acting after spending a year at the Central School of Speech and Drama.
Before pursuing an acting career he was involved in music Acting His stage roles include Gorgio at the Bristol Old Vic, Assembly and A Good Night Out in the Valleys at National Theatre Wales, and The Sanger at Sherman Cymru. In 2011, he was named on the Screen International Stars of Tomorrow list.
Cullen starred in the 2011 film Weekend as Russell, a Nottingham lifeguard.
His television roles include Jonas in Black Mirror, drug trafficker Yoram in Banged Up Abroad, and Richard in Pen Talar. He starred as Wulfric in the 2012 miniseries World Without End.
He had a recurring role as Mary Crawley"s suitor Anthony Foyle (the Viscount Gillingham) in Downton Abbey. Recent films include Desert Dancer, the story of Iranian dancer Afshin Ghaffarian, who risked his life to become a dancer despite a nationwide dancing ban, and the science fiction The Last Days on Mars, based around the first manned mission to Mars.
Upcoming films include Happily Ever After, Number Compass in the Wilderness, and A Hundred Streets.
Cullen played Joe Rose in the new three-part Independent Television drama The Trials of Jimmy Rose, airing in September 2015. The movie filmed in July, 2015. He will play the lead role of Mark in Harlan Coben"s The Five, a ten-part Sky 1 mystery series.
Cullen"s editorial work includes L"Uomo Vogue, Vogue Italia, Vanity Fair, and 10 Magazine.
Writing Since 2011, Cullen has been in a relationship with Canadian actress Tatiana Maslany, whom he met filming the Channel 4 miniseries World Without End.