John Alexander Sinclair
| John Sinclair | |
|---|---|
| Allegiance |
United Kingdom 
|
| Service | Secret Intelligence Service (SIS/MI6) |
| Active | 1953–1956 |
| Rank | Chief of the Secret Intelligence Service |
| Award(s) | KCMG, CB, OBE |
|
|
|
| Born | 29 May 1897 Fulham |
| Died | 22 March 1977 (aged 79) Funtington |
| Nationality | British |
| Occupation | Intelligence officer |
Sir John Alexander Sinclair, KCMG, CB, OBE (29 May 1897 – 22 March 1977) was Head of the Secret Intelligence Service from 1953 to 1956.
Sinclair was Educated at Winchester College & Dartmouth Naval College, commissioned into the Royal Army Service Corps. In 1938 he was appointed an Instructor at the Staff College, Camberley. By 1941 he was Deputy Director of Operations at the War Office and then in 1942 he became Director Royal Artillery for 1st Division. In 1944 he was appointed Director of Military Intelligence at the War Office. In 1946, while still in the British Army he started working for the Secret Intelligence Service.
Following his retirement from the military in 1952, as a Major-General, he was appointed head of the British Secret Intelligence Service, taking up the post in 1953. He led the Service through the translation from its wartime operations, directing operations in the emerging Cold War environment in a "practical and responsible fashion", "instead of accommodating the risk takers". He also introduced reforms to recruitment and conditions of service designed to introduce a professional career structure within SIS suited to post-war conditions. His personal integrity was recognised not just by colleagues, but also by opponents.
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