Andrew Marr is stepping down as the BBC's political editor to take over Sir David Frost's Sunday interview show.
Andrew Marr will continue to present "landmark" shows on the BBC
Marr has been a fixture on BBC news bulletins for five years. He will leave the post in the summer to take over Sir David's breakfast show in September.
The BBC paid tribute to Marr's "wit and vitality as well as his tremendous knowledge, analysis and insight".
Sir David, who has interviewed big names on Breakfast with Frost for 12 years, retires from the show on 29 May.
The Frost Interview, to be presented by Sir David, will start later in the year.
Marr, former editor of The Independent newspaper, took over from Robin Oakley as the BBC's top political reporter in 2000.
Sir David Frost recently received the fellowship award at the TV Baftas
He has been praised for an unpretentious and friendly style - characterised by his arm-waving delivery - that has attempted to liven up political reporting.
He will remain as host of BBC Radio 4's Start the Week and will present other "landmark" programmes including A History of Modern Britain.
BBC director of news Helen Boaden said Marr had been a "brilliant" political editor who made a "huge impact with our audiences".
"We shall miss him in this role but look forward to the unique range of qualities he will bring to the world of politics on Sunday mornings," she said.
"We will also miss David's enormously engaging and informative weekly input.
"For more than a decade, we have benefited from star guests and his inimitable way of getting the best out of them."
More details of Marr's new Sunday morning show will be announced nearer the launch.