Mahony was born at Fermoy in County Cork in January 1913, and was educated in Dublin at The King's Hospital.
[1] He joined Clontarf in 1938, where he would remain playing regular club cricket until 1955, and sporadically until 1963.
[1] He made his debut in first-class cricket for Ireland against Scotland at Glasgow in 1948.
Outside of cricket, Mahony was also a capable rugby union player, representing both Cork-based Dolphin and Dublin-based Clontarf.
[1] Married to Joan Esteemed member of Hermitage Golf Club He died, two weeks shy of his 94th birthday, in (28th?)