The bank said Mr Pettigrew had been appointed a non-executive director and chair of the Board following a selection process.
AIB said Mr Pettigrew has over 30 years experience in UK and international financial services leadership in public, listed and private company environments, including at board level, as chief executive and as chair.
He was chair of Scottish Financial Services, the Scottish financial services trade body and also served as co-chair of Scotland’s Financial Services Advisory Board (FiSAB) with the First Minister of Scotland.
The Irish Times reported last February that AIB was preparing to appoint acting interim chairman Brendan McDonagh as its new chair but Mr McDonagh, the current vice chair, withdrew his candidacy for personal reasons.
Mr McDonagh said Mr Pettigrew “brings a wealth of experience to the group including in retail banking which, combined with his track record of providing clear strategic direction and vision at both the executive management and board levels, will enable him to make a very significant contribution to the board and the group over the coming years.”
Senior independent director Carolan Lennon, who led the appointment process, said: “On behalf of the board, I want to thank Brendan McDonagh, our deputy chair, for his leadership of the board and the AIB group through the Covid pandemic. We look forward to his continued contribution to the board in the future.”