Top Definition
An English stage and screen actor, probably most well known for playing the role of the Master on the long-running British sci-fi Doctor Who. Simm is currently 41 and married to actress Kate Magowan with a son and a daughter.
Person 1: John Simm is a great actor!
Person 2: Who's he?
Person 1: Have you ever seen Doctor Who? He was on there once.
Person 2: Ohh, so that's his name!
by Who's Who Whovian December 22, 2011

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