O'Casey refers to Sean O'Casey, an influential Irish playwright known for his works that explore themes of social injustice and the struggles of the working class. Born in 1880 in Dublin, he became a prominent figure in the Irish theatre movement, particularly with his plays set against the backdrop of the Irish War of Independence and the Irish Civil War. His most famous works include "The Shadow of a Gunman," "Juno and the Paycock," and "The Plough and the Stars." O'Casey's writing is characterized by its blend of realism and poetic language, often highlighting the complexities of human relationships and the impact of political turmoil on everyday life. He was a member of the Abbey Theatre and faced criticism for his candid portrayal of Irish society. Despite this, his contributions to theatre have left a lasting legacy, influencing generations of playwrights and enriching the cultural landscape of Ireland.