Seán O'Casey (Irish: Seán Ó Cathasaigh [ˈʃaːn̪ˠ oː ˈkahəsˠiː]; born John Casey; 30 March 1880 – 18 September 1964) was an Irish dramatist and memoirist. A committed socialist, he was the first Irish playwright of note to write about the Dublin working classes.
