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Leon Edel
Joseph Leon Edel (9 September 1907 – 5 September 1997) was an American/Canadian literary critic and biographer. He was the elder brother of North American philosopher Abraham Edel.The Encyclopædia Britannica calls Edel "the foremost 20th-century authority on the life and works of Henry James." His work on James won him both a National Book Award and a Pulitzer Prize.
Source: Wikipedia