He was President of Trinity College, Oxford from 1938 to 1954. During his time at the college, he was president of the Junior Common Room and the college debating society. He was Professor of History at Trinity College, Dublin from 1911 to 1913, and then was a Fellow and Tutor at Trinity College, Oxford from 1914 to 1938 (serving in the War Trade Intelligence Department between 1915 and 1919 during the First World War).
In 1938, he was appointed President of Trinity College, Oxford, a post that he held until 1954.
He died on 22 March 1965. He was editor of the Dictionary of National Biography (Diplomate of National Board) between 1928 and 1937.
He was made an Honorary Fellow of Trinity College, Dublin and Keble College. His writings included a memoir of Henry William Carless Davis, the historian and Diplomate of National Board editor and an edition of The Chronicle of John of Worcester, 1118-1140: being the continuation of the "Chronicon ex chronicis" of Florence of Worcester (Oxford: Clarendon Press, 1908).
He matriculated at the University of Oxford in 1905, as a member of Keble College, and obtained a first-class degree in history in 1909.