Russell Slade has been confirmed as the new manager of relegated Grimsby.
Slade led Boro to the FA Cup fourth round
Slade has left Conference side Scarborough, where he has been at the helm for almost three years, to fill the vacancy left by Nicky Law.
Law took over at Blundell Park in March but failed to stop the club from a second successive relegation.
Slade, who has also had spells in charge of Notts County and Northampton, guided Scarborough to the fourth round of the FA Cup before losing to Chelsea.
A clause in Slade's contract allowed him to leave Boro, owing to Grimsby's status as a League club.
Grimsby had earlier confirmed they wanted to interview Slade as well as former Stoke boss Steve Cotterill.
Slade, who has signed a two-year deal, said: "This is a great opportunity for me.
"I relish the opportunity to manage this club, which has a fine tradition of producing good teams.
"With the crowds that Grimsby pull in and with everyone pulling together and being committed to the cause, we can achieve our goals."