Morris served in the army from 1915 to 1934. After serving in the trenches during the First World War, he transferred to the Indian Army"s 3rd Gurkha Rifles. He took part in two attempts to climb Mount Everest, the first of which, under General Charles Granville Bruce and climbing leader Lieutenant-Colonel Edward Lisle Strutt, was in 1922 and then in 1936 under Hugh Ruttledge.
On the latter, his personal servant was Tenzing Norgay, who made the first ascent of Mount Everest with Edmund Hillary in 1953.
He retired from military service in the mid 1930s and taught English in Japan. He was Professor of English Literature, Keio University and lecturer at Imperial and Bunrika Universities, Tokyo from 1938 and also adviser on the English language to Japan"s Department of Foreign affairs
He was repatriated by the Diplomatic corps after Japan"s entry into the Second World War and joined the British Broadcasting Corporation, running their Far East service. Morris was head of the British Broadcasting Corporation Far Eastern Service 1943-1952, and controller for the British Broadcasting Corporation Third Programme 1952–1958.
From February 1943 to October 1943 he worked in the same department as George Orwell, at 200 Oxford Street.
He wrote an article about Orwell, "Some are more equal than others", for Penguin New Writing Number 40, September 1950 which was reprinted in Orwell Remembered with the title "That Curiously Crucified Expression":
George Orwell always reminded me of one of those figures on the front of Chartres Cathedral my inability to enjoy his filthy cigarettes was symbolic. lieutenant represented other things which made any sort of intimacy between us quite impossible. Stephen Spender described Morris in his Journals as:
He was made a Commander of the Order of the British Empire in 1957 and appeared as a "castaway" on the British Broadcasting Corporation Radio programme Desert Island Discs on 16 February 1959.