From 2003 to 2005, Walliams co-wrote and co-starred in three series of the BBC sketch show Little Britain with Matt Lucas.The programme first aired on BBC Three before moving to the more mainstream BBC One.), is an English comedian, actor, talent-show judge, author, presenter, and activist, known for his partnership with Matt Lucas on the BBC One sketch show Little Britain.Since 2012 Walliams has been a judge on the ITV talent show Britain's Got Talent.A spin-off series produced in the United States by HBO, Little Britain USA, aired in 2008.In 2005, Walliams, Simon Pegg, Lucy Davis and Lauren Laverne starred in the video for Charlotte Hatherley's single Bastardo.Among the characters Walliams played were Emily Howard, a deluded "transvestite", Ray Mc Cooney, an insane Scottish hotel owner, and Sebastian Love, an aide de camp to the Prime Minister (portrayed by Anthony Head) on whom Love has a huge crush.The characters from Little Britain, played by Walliams and Lucas, appeared in a 2010 UK television advertising campaign for the Nationwide Building Society.
In June 2015, it was announced that Big School would not be returning for a third series. The show returned for a full series in November 2016, and a second series has been announced.
He changed his stage name to David Walliams when he joined the actors' union Equity, as there was already a member named David Williams.
Walliams performed in the Big Finish Productions Doctor Who audio play Phantasmagoria, written by Mark Gatiss.
In January 2005 Walliams and Lucas were named the most powerful people in TV comedy by Radio Times.
On 26 August 2008 Walliams made his stage debut at the Gate Theatre in Dublin opposite Michael Gambon in Harold Pinter's No Man's Land, in front of an audience that included Pinter himself.