Hurn is a self-taught photographer. He began his career in 1955 when he worked for Reflex Agency. He gained his reputation as a photojournalist for his documentation of the Hungarian revolution of 1956, and is featured in two of Ken Russell's films for the Monitor television arts' series, A House in Bayswater (1960), and Watch the Birdie (1963). In 1965 he became associated with Magnum Photos and became a full member in 1967.
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