Mark Gatiss

Mark Gatiss (born October 17, 1966) is an English actor, comedian, screenwriter and novelist. As a writer, Gatiss has worked on such shows as Doctor Who, Sherlock (which he co-created and played Mycroft Holmes on) and Agatha Christie's Poirot. He is also a member of the comedy team The League of Gentlemen.

For Disney, Gatiss portrayed Giles in the upcoming film Christopher Robin.