Mark Gatiss was born in 1966 in Sedgefield, England. He studied Theatre Arts at Bretton Hall College, where he met Jeremy Dyson who later would co-write for sketch comedy team A League of Gentleman with Gatiss, and also performers Reece Shearsmith and Steve Pemberton. The League of Gentleman started as a stage act from 1995, winning the Perrier Award at Edingburgh Fringe. It then transferred to Radio 4 before transferring gain to BBC Two, being televised for the first time.
Other notable television and film work includes The Matrix, Game of Thrones and The Wind in the Willows. He also co-produced and co-created Sherlock, starring Benedict Cumberbatch.
In the theatre world, Gatiss has performed in Art at the Whitehall Theatre and All About My Mother at the Old Vic. He's also been in Seasons Greetings, The Recruiting Officer and gave an Olivier Award-nominated performance as Menenius in Coriolanus at the Donmar Warehouse.