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McIver received a degree from Coleraine, a PGCE from Queen's University and a master's from Jordanstown. He headed to St Mary's, where his involvement with Paddy Tally began. Tally got involved with Down and brought McIver in along with him. McIver was part of the Down backroom team for the 2010 All-Ireland Senior Football Championship Final. McIver said in 2022 that he still thought Down would have won that game if Ambrose Rogers hadn't injured himself.
McIver was appointed Derry manager in 2012, being announced in the same month Jim McGuinness led McIver's former Donegal players to an All-Ireland Senior Football Championship title. Joe Brolly was particularly critical of McIver's management. McIver brought Derry to a Division 1 final in 2014. He quit the Derry management role in 2015, criticising Conor Lane on live television in his parting interview while confirming his departure. Earlier that season, he had criticised David Coldrick and then Ciaran Brannigan.
But McIver remained as Oak Leaf Director of Football. He spent three years as Oak Leaf Director of Football after quitting as Derry manager. He was reported to be stepping down after four years in 2019.
McIver's son Michael is a Gaelic footballer, and McIver has managed him.
O'Leary, Conor (18 July 2015). "Brian McIver Resigns With Sensational Interview Lambasting Referee". Balls.ie. The outgoing boss announced it in his post-game interview with RTE, which was a bizarre lambasting of the referee over his handling of the game, with focus on the black card and the lack of a penalty to Derry in the game.