biographical article needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately, especially if potentially libelous or harmful. (November 2010) For the professional footballer of the 1950s, see Johnny Simm. John Simm Born 10 July 1970 (1970-07-10) (age 40) Leeds, Yorkshire, England, UK Occupation Actor Years active 1992–present Spouse Kate Magowan (2004–present) John Simm (born 10 July 1970) is an English stage and screen actor. He is known for his roles as Sam Tyler in the detective drama Life on Mars and as The Master in the revival of the science fiction series Doctor Who. He has also starred in many highly acclaimed award-winning television dramas such as The Lakes, Cracker, State of Play, Crime and Punishment, Clocking Off and Sex Traffic and films such as Human Traffic, Wonderland and 24 Hour Party People. As a stage actor, he is an Olivier award nominee, and in 2010, he played Hamlet at the Crucible Theatre..