[2] He created a role in Ninette de Valois' 1940 The Prospect Before Us, before leaving to serve in the Royal Air Force from 1942 to 1946.
[4] He returned as a principal dancer, creating roles in Frederick Ashton's Sylvia (1952) and Homage to the Queen (1953).
[2] He resigned in 1970, and took up a position as head of the dance division of the United States International University.
[4] His last major position was as artistic director of Salt Lake City’s Ballet West from 1986 to 1997.
[1] Hart received the Queen Elizabeth II Coronation Award of the Royal Academy of Dance in 1970, and was made a Commander of the Order of the British Empire (CBE) in the 1971 New Year Honours.