Question: Who was the first Irish playwright of note to write about the Dublin working classes, Colson Whitehead or Seán O'Casey ?
Sentence (from "Seán O'Casey"): Seán O'Casey ( ; Irish: "Seán Ó Cathasaigh" , ] ; born John Casey, 30 March 1880 – 18 September 1964) was an Irish dramatist and memoirist.
Relevant evidence: Yes