On graduating, Hood aspired to a career in Journalism and took a position with The Times of London, where within a few years he was promoted to the post of a sub-editor. His work in the area of politics gained the attention of the Australian Department of External Affairs, which he joined in 1936 and took the role of liaison officer for the Department at the High Commission in London. In 1939 he was posted to Canberra and served in various posts in the department, including periods acting as secretary of the department. Hood's first high-level posting was on 16 October 1945 when he was sent to the Hague in the Netherlands to set up a new resident legation as chargé d'affaires. After completing this posting by 1946, Hood acted as political adviser to the Australian Military Mission in Berlin and in 1947 was appointed to succeed Paul Hasluck as the second Permanent Representative of Australia to the United Nations in New York City. As Australia served as a non-permanent member of the first United Nations Security Council, Hood served on the council and as president of that body in December 1947. In January 1947 hood served on the United Nations Commission for Investigation of Greek Frontier Incidents and later in May 1947 as Australia's representative on the United Nations Special Committee on Palestine. Serving until 1950, Hood was then appointed on 22 April 1950 by Foreign MinisterPercy Spender as Australia's first Ambassador to Indonesia. The post was considered an important one, with The Advocate opining that Australia should be offer advice and technical assistance to the Sukarno Government as Indonesia was "suffering the growing pains of nationhood". Hood was recalled to Australia briefly in May 1950 to discuss matters relating to Indonesia's claim to western New Guinea and the death of an Australian pilot, John Doderick, who was fatally shot in Jakarta that month. Serving in Indonesia until 1952, Hood was appointed in September 1952 as Ambassador to Germany, on 4 September he presented to President Theodor Heuss. As ambassador in Bonn, Hood also became the head of Australia's Military Mission in Berlin. In January 1955 Hood was awarded with the Commander of the Order of the British Empire. In 1956 Foreign Minister Richard Casey recalled Hood from Bonn to advise him on Cold War matters. In 1957 he was elected President of the United Nations Trusteeship Council. In March 1963 Hood was appointed as Ambassador to Israel, serving until his retirement from foreign service September 1964.
