Andrew Marr has announced he is leaving the BBC after 21 years.
The journalist said he would be joining media company Global, which runs radio stations including LBC, Capital and Radio X, as a writer and presenter from next year.
Marr, 62, who said he was "keen to get his own voice back" with the move, will also write for newspapers.
His Sunday morning talk show 'The Andrew Marr Show' has been running for 16 years.
In a tweet, he wrote: "After 21 years, I have decided to move on from the BBC. l leave behind many happy memories and wonderful colleagues. But from the New Year I am moving to Global to write and present political and cultural shows, and to write for newspapers."
He added: "I think British politics and public life are going to go through an even more turbulent decade, and as I’ve said, I am keen to get my own voice back.
"I have been doing the Andrew Marr show every Sunday morning for 16 years now and that is probably more than enough time for anybody!"
Marr will host an opinion-led programme on LBC which will see him “give his view on the biggest issues of the moment” alongside guests, Global said.
He will also present a new programme on Classic FM, playing music and interviewing guests from the world of politics and arts, host a weekly podcast on Global Player and write a regular column for the LBC website.
Ashley Tabor-King, founder and executive president of Global, said: “Andrew is one of the finest and most respected broadcasters and journalists of our time and we are honoured to welcome him to the Global family, especially at a moment when we are celebrating record audience figures.
“LBC now takes its next step. Andrew Marr will be an unmissable moment in the schedule and we are excited that he will be part of LBC and Classic FM’s incredible presenter line-up.”
Fran Unsworth, the BBC’s outgoing director of news and current affairs, said: “Throughout his long and distinguished career at the BBC, Andrew has been a firm favourite with our audiences.
“Andrew started at the BBC as a knowledgeable and insightful political editor and went on to become a feature of the UK’s Sunday mornings, on Sunday AM, which became the Andrew Marr Show. He is a fantastic presenter and interviewer, whose wisdom and skill will be a loss to our screens.
“We thank him greatly for his years of service and wish him the best of luck in his new role.”
Marr joined the BBC in May 2000 as political editor, a position he held for five years.
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