 He worked with Marconi to develop a fleet wireless system and this achievement was recognised with his election as a Fellow of the Royal Society in 1901.He went on to be Assistant Director of Naval Ordnance at the Admiralty in February 1902, Commanding Officer of the battleship HMS "Duncan" in October 1903 and Captain of the torpedo school HMS "Vernon" in September 1904.Jackson went on to be Third Sea Lord and Controller of the Navy in February 1905 and, having been appointed a Naval Aide-de-Camp to the King on 12 September 1905, he was promoted to rear admiral on 18 October 1906.