Carroll trains as a teacher at St. Patrick’s College, Dublin and settles in Glasgow, Scotland in 1921 as a teacher. Several of his plays are produced by the Abbey Theatre in Dublin. He is a close friend of Patrick Kavanagh in the 1920s.
Carroll marries clothing designer Helena Reilly in Glasgow in 1923. They have four children, actress Helena Carroll, musician and producer Theresa Perez, journalist Kathleen Carroll and son Brian Carroll who resides in London. He is grandfather to Helena Perez Reilly and great grandfather to Paul Vincent Reilly. His brother, Niall Carroll, is a film critic.
Carroll founds two theater groups in Glasgow: the Curtain Theatre company, with Grace Ballantine and Molly Urquhart, in 1933 and the Glasgow Citizens’ Theatre in 1943. He remains the director and playwright in residence of the Citizens’ Theatre until his death.
The Wayward Saint is made into an opera in Germany in the 1960’s and his daughter Theresa commissions and produces an opera of his Beauty is Fled from the collection Plays For My Children which opens at Phoenix Symphony Hall in the 1970s as part of Theresa’s “Children’s Opera Series.”