He was born in Dublin in 1895 to an affluent family, second son of Dr. Charles Casey and his wife Mary Genevieve Conran.
Taoiseach John A. Costello chose him as Attorney General in 1950 to replace Cecil Lavery.
The following year he was made a judge of the High Court, but he died after only fifteen months on the Bench.
[1] Casey, like Lavery, continued to take private work while Attorney General, with the approval of Costello.
1 since while still Attorney General he was required to urge the Supreme Court to interpret the Constitution in the way which suited his client's private interests.