The eight years Justin spent on the other side of Atlantic was bookended by some of the most powerful events in US history - the attacks of 9/11 and the election of Barack Obama.
"I went to America thinking it was like Britain only bigger," he says. "I came away realising that culturally, it is unique."
"And if you don't get hung up on the eating competitions and dotty preachers, it's the worlds most wonderful country."
Despite writing on his blog Justin Webb's America that there was nowhere in the world he would rather be than Washington DC, the lure of bad weather and 3am starts persuaded him to relocate to the UK.
"I forgot to write 'except studio S1 in the morning' on my blog," he says. "This is the only job that would have lured me away. And if it goes wrong, I'll be on the next plane back."
Justin is no stranger to the Today office - his second job in the BBC was as a reporter for the programme.
He joined the BBC as a graduate trainee in 1984 working in Northern Ireland for BBC Radio Ulster based in Belfast.
After leaving Today, he worked as a foreign affairs correspondent based in London covering news around the world.
He then presented the BBC news - moving from Breakfast to the Six O'Clock News - during which time he interviewed prime ministers John Major and Tony Blair.
There then followed three years working as the BBC's Europe correspondent based in Brussels before being posted to Washington as the chief radio correspondent in 2001.
He was educated at Sidcot school, Somerset and graduated from the London School of Economics with a degree in economics.