Who was the first Irish playwright of note to write about the Dublin working classes, Colson Whitehead or Seán O'Casey ?
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. Seán O'Casey:  A committed socialist, he was the first Irish playwright of note to write about the Dublin working classes. Colson Whitehead: Colson Whitehead (born November 6, 1969) is an American novelist.
Seán O'Casey