For ten years from 1925 he taught history at Stonyhurst College, then from 1935 to 1939 was a visiting professor of the University of Notre Dame, Indiana, where he carried out economic research.
[1] Immediately after the war, he was elected as Member of Parliament for Devizes in Wiltshire and held the seat until he retired undefeated in 1955.
While in the House of Commons, he showed an independent spirit, for example by supporting the abolition of capital punishment while that was not his party's general view, and was popular on all sides.
His last book, Oxford in the Twenties (1976) is about his wide circle of friends, including Evelyn Waugh, Maurice Bowra, Harold Acton, Leslie Hore-Belisha, and the cricketer R. C.
Richard King, Rector of Cholderton, and herself also a Roman Catholic convert, and they had one daughter and three sons, including Crispian Hollis, Bishop of Portsmouth.