Career
An advocate of Catholic university education, he contributed to the Dublin Review (1847) an article which the Catholic Truth Society of Ireland reprinted under the title "Trinity College No Place for Catholics". In 1842 he was called to the Bar and joined the Munster Circuit. After Gladstone had passed his Irish Land Act, he chose O'Hagan as the first judicial head of the Irish Land Commission, making him for this purpose a judge of Her Majesty's High Court of Justice.
