Christopher Samuel Youd was a British writer best known for his science fiction published under the pseudonym John Christopher. His many novels include The Death of Grass and The Possessors. He won the Guardian Prize in 1971 and the Deutscher Jugendliteraturpreis in 1976, Youd also wrote under several other names including Stanley Winchester, Hilary Ford and Samuel Youd. Christopher Samuel Youd was a British author best known for his science fiction published under the pseudonym John Christopher. His many novels include The Death of Grass and The Possessors. He published The World in Winter in 1962 and won the Guardian Prize in 1971. Youd also wrote under several other names including Stanley Winchester, Hilary Ford and Samuel Youd.