Born on October 18, 1992, in Dublin, Ireland, he overcame a challenging childhood, spending years in foster care. He began acting in 2011, gaining recognition with roles in "71" and "Mammal." His breakthrough came with "The Killing of a Sacred Deer" in 2017, earning critical acclaim. Known for his versatility, he appeared in "Dunkirk," "American Animals," and "Calm with Horses." He received an Oscar nomination for "The Banshees of Inisherin" and played Druig in Marvel's "Eternals."