Reginald Teague-Jones MBE (30 July 1889 – 16 November 1988)[1] was a British political and intelligence officer. He was active in the Caucasus and Central Asia during the Russian Civil War. For the last 66 years of his life he was known as Ronald Sinclair. Under that assumed name, he authored two published accounts of his travels and adventures in Asia and the Middle East.[2]