He was the son of Edward Smith, formerly a member of the Stock Exchange.
In 1905 Masterton-Smith married Barbara Crosbie-Hill. She was the eldest daughter of W. S. J. Crosbie-Hill, JP, of the Red House, Sevenoaks, Kent. They had one son and one daughter. His first wife died in 1921 in tragic circumstances.
In 1923 Masterton-Smith married Marjorie, the only daughter of Hubert B. Marten of 15 Mallord Street, London, SW3.
He entered the Home Civil Service (Class I). His career is summarised:
- 1901 Admiralty,
- 1904-1908 Private Secretary to the Second Sea Lord,
- 1908-1910 Private Secretary to the Permanent Secretary,
- 1910-1917 Private Secretary to successive First Lords of the Admiralty (Mr Reginald McKenna, Mr Winston Churchill, Mr Arthur Balfour, Sir Edward Carson, and Sir Eric Geddes,
- Sep 1917 - Jan 1919 Assistant Secretary, Ministry of Munitions,
- 1919-1920 Assistant Secretary (Additional), War Office and Air Ministry,
- 1920-1921 Joint Permanent Secretary, Ministry of Labour,
- 1921-1924 Permanent Under-Secretary of State for the Colonies,
- 1924 retired.
He was a member of the official side of the National Whitley Council for the Civil Service;
- Kensington Tragedy: Lady Masterson-Smith's Death, Fulham Chronicle, 26 August 1921, London
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