Stephen Fry is to step down as the host of BBC Two comedy quiz show QI after 13 years.
The presenter said it was "one of the best jobs on television" but felt "it was time to move on".
He will be replaced by Sandi Toksvig, who called it her "dream job". She stood down as chair of BBC Radio Four's The News Quiz earlier this year after a 10-year run.
Alan Davies will remain as resident panellist.