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Mark Gatiss is a British actor, writer, and director. He is best known for his work on the BBC's Sherlock and Doctor Who. Gatiss is also a member of the comedy team The League of Gentlemen. The League of Gentlemen is a British sketch comedy series that first aired on BBC Two in 2000. The series is created by Gatiss, Steve Pemberton, Reece Shearsmith, and Jeremy Dyson.