 He was promoted to Admiral of the Fleet on 31 July 1919 and retired from the Royal Naval College in August 1919.He was appointed the first Chairman of the Radio Research Board of the Department of Scientific and Industrial Research in 1920 and also won the Hughes Medal from the Royal Society "for his pioneer work in the scientific investigations of radiotelegraphy and its application to navigation" in 1926.In the 1920s, Jackson assisted Winston Churchill by checking some of the facts in his books on the Great War, "The World Crisis".