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Dan Patterson (born March 1960) is a British television producer and writer, best known as co-creator, alongside Mark Leveson, and producer of both the British and American incarnations of the comedy improvisation show Whose Line Is It Anyway? and the British satirical comedy panel show Mock the Week. Patterson and Leveson created Whose Line Is It Anyway? initially as a 6-episode radio show for the BBC in 1988. Wikipedia