Dr O'Hagan, who graduated in Economics from Queen’s University, is currently Chair of Northern Ireland Water, Chair of the All-Island Congenital Heart Disease Network, a Director of Independent News & Media Ltd and a Director of the College of Anaesthesiologists.
A Fellow of the Institute of Directors, Dr O'Hagan’s previous appointments include Chair of Belfast Harbour Commissioners, Chair of the Metropolitan Arts Centre (MAC), CEO of the Royal College of Physicians and a Director of the Ireland - US Council. He has held senior positions in a number of international public companies including Smurfit, Fitzwilton and Reed International, and continues to be a director in a number of private companies.