 In 1914 he married Chalmers's daughter, Mabel, and in 1915 he was promoted to Principal Assistant Colonial Secretary.In May 1917, Stevenson was appointed Chief Secretary of Cyprus, in which post he administered the government from November 1918 to August 1920, when he was appointed High Commissioner.In May 1925, when Cyprus was given the status of a Crown Colony, he became the first Governor, holding the post until November 1926.