The son of Arthur James Mason, he was educated at Eton College and King's College, Cambridge, taking a first class honours degree in Modern History in 1926.
[1] Joining the Foreign Service in 1928, Mason had overseas postings to Brussels, Sofia, Prague, Ottawa, and Lisbon and also home posts at the Foreign Office in London.
[1] Mason was recalled to London as assistant Under Secretary of State at the Foreign Office from 1951 to 1954.
[1] In retirement, Mason was High Sheriff of Nottinghamshire for 1970 and Treasurer of the University of Nottingham from 1972 until his death.
At the time of his death his address was Morton Hall, Retford, Nottinghamshire, the family seat.