Steve Agnew stepped into the Riverside hotseat following the club's decision to part company with Aitor Karanka 2017.
Agnew moved into the role after a couple of successful years as Karanka's assistant head coach, and was charged with turning our fortunes around in the Premier League.
A midfielder during his playing days, Agnew's most notable contributions were with Barnsley, Leicester City, Sunderland and York City.
Moving into coaching, Agnew cut his teeth in Boro's Academy either side of spells as assistant at Gateshead and Hartlepool United.
Rejoining Boro in 2007 as reserve team manager, a position he had previously held at Leeds United, Agnew would progress to become our assistant head coach, and subsequently caretaker boss following the departure of Gordon Strachan.
A spell with Hull City followed, as assistant to Steve Bruce, before returning to Boro to replace Craig Hignett as Karanka's no.2.
Upon becoming Boro's boss in early 2017, Agnew was unable to prevent relegation to the second tier - which ultimately brought an end to his third spell at Rockliffe Park.
Rejoining Bruce, then with Aston Villa, later that year, Agnew has since returned to managerial duties with Sheffield Wednesday, where he acted as caretaker before the arrival of his long-term associate in early 2019.