Education
He studied at Elizabeth College, Guernsey, and then attended the Royal Military College, Sandhurst.
He studied at Elizabeth College, Guernsey, and then attended the Royal Military College, Sandhurst.
He was appointed acting Governor of British Ceylon in 1863 and held the office for two years, succeeding Charles Justin MacCarthy. In 1881 he was appointed governor of Heligoland, knighted in 1888 and became governor of Newfoundland in 1889. O'Brien as governor of Newfoundland helped precipitate the 1894 bank crash by his many dispatches to London noting that Newfoundland politicians under Premier William Whiteway's Liberal Government were uniquely corrupt and incompetent.
He resigned from office in 1895 and returned to London. The Newfoundland community of Terenceville was so named in his honour. O'Brien's son, Sir Charles O'Brien, also became a colonial governor.