Mark O’Halloran is a writer and actor from the west of Ireland. On screen, he has appeared in numerous films, most notably as one of the eponymous heroes in Adam & Paul (which he also wrote), and as the lead role of MP in History’s Future, directed by Fiona Tan. He also featured in Shane Meadows’ Channel 4 drama The Virtues, for which he won Best Supporting Actor at the IFTA Awards 2020.

Upcoming projects include the feature film The Miracle Club, alongside Maggie Smith, Kathy Bates, and Laura Linney. He also appeared in Oliver Hermanus’ TV drama Mary & George, playing Sir Francis Bacon opposite Julianne Moore. Recently, Mark starred in Marina Carr’s Portia Coughlan at The Almeida Theatre, London.

As a writer, Mark’s credits include the films Garage and Adam & Paul, the television series Prosperity, Viva (a Spanish-language feature set in Havana, Cuba), and Rialto, which premiered at the 2019 Venice Film Festival. His television work includes Sally Rooney’s Conversations With Friends. His work has been showcased at major festivals such as Venice, Cannes, Berlin, Toronto, Telluride, and Sundance.

For the stage, Mark wrote the play Trade, contributed text to the award-winning Lippy, and co-wrote Beckett’s Room for Dead Centre at The Gate Theatre. In 2021, he premiered two new plays: Conversations After Sex at the Dublin Theatre Festival (which won Best New Play at the Irish Theatre Awards 2022) and a stage adaptation of Bergman’s The Silence at the Stadsteater in Göteborg, Sweden. He also wrote the libretto for the opera adaptation of Trade, composed by Emma O’Halloran, which premiered at New York’s Prototype Festival and transferred to LA Opera.