Alan Buckley has been appointed Grimsby manager for a third time.
Buckley's last job was manager of Rochdale before he was sacked in 2003
The 55-year-old is the most successful manager in the Mariners' history, leading the club to three promotions in his previous spells at Blundell Park.
Buckley has signed a two-and-a-half year contract and replaces Graham Rodger, who left on Monday.
A club statement said: "Alan reiterated his desire to return the Mariners to their former glories, describing it as 'unfinished business'."
Buckley's first spell ended when he left to take over at West Brom after six years at Blundell Park.
He returned in 1997 and stayed for three years.
"Numerous applications for the manager's role were received but of them all Alan Buckley stood head and shoulders above the rest," said the club.
"Throughout his two interviews with the board, he exuded all the hunger and confidence that made the board's decision to reappoint Town's most successful manager unequivocal."