Andrew Gilligan is leaving the London Evening Standard to join Telegraph Media Group as its London editor.
In his new role, Gilligan will contribute news, features and regular columns, working across the Daily and Sunday papers and Telegraph.co.uk.
The move marks a return to the group for Gilligan, who spent four years as the Sunday Telegraph’s defence correspondent from 1995 to 1999.
He then became the BBC’s defence and diplomatic correspondent, but resigned in 2004 in the wake of the David Kelly controversy.
It was his report on BBC Radio 4’s Today programme about the case for going to war in Iraq that sparked a major row between the corporation and the government.
The BPA judges praised his series of stories revealing allegations of corruption surrounding the office of then-London mayor Ken Livingstone.
Gilligan was also a runner-up in the Paul Foot Award for investigative journalism in the same year.
Sunday Telegraph editor Ian MacGregor said in a statement: “He has a fantastic track record as one of the best investigative reporters in the country.”
Gilligan added: “The Telegraph is establishing itself as Britain’s most important journalistic rainmaker.
“I want to be a part of that and I am very excited to be joining.”