He was editor of Irisleabhar na Gaedhilge (The Gaelic Journal), Professor of Irish in University College Cork and Dean of the Faculty of Celtic Studies.
He was born in Carrignavar, County Cork, which was an Irish-speaking area, and educated there and at St Patrick's Teacher Training College, Drumcondra, Dublin.
[1] He first came to notice when he edited the work of Máire Bhuidhe, the folk poet of West Cork and author of "Cath Céim an Fhíodha".
[citation needed] In 1916 he became Professor of Irish and later Dean of the Faculty of Celtic Studies at University College Cork, where he remained until his death.
His brother Eamon O’Donoghue was author of Slán le Corcaigh and Drúcht Geal Ceoidh, also a professor of Irish in UCC.