Author: Peter Graaf
Alternate names: John Christopher; John (pen name used by Christopher Samuel Youd) Christopher; Hillary Ford, William Godfrey, Peter Graaf, Peter Nichols, Anthony Rye, William Vine
Born: 16 April 1922
Died: 3 February 2012
Bio: Peter Graaf was a pen-name of Samuel Youd, who wrote under a number of pseudonyms and was particularly noted for his works written as John Christopher such as the Tripods Trilogy or the Sword of the Spirits Trilogy.