Career
Cassels joined the Royal Navy in 1947. He was Navigation Staff Officer to Chief of the Polaris Executive from 1963 to 1966 and went on to command HMS Fearless in 1972. He became Assistant Chief of the Naval Staff (Operational Requirements) in 1978, Flag Officer, Plymouth and Admiral Superintendent at Devonport in 1981 and Second Sea Lord and Chief of Naval Personnel as well as President of the Royal Naval College, Greenwich in 1982.
He retired in 1986.
In retirement his activities included serving as Chairman of the Modern Apprentices Advisory Committee. He lives at Exton in Hampshire.
