Aengus is an Irish politician. He was re-elected in May 2007 for the second time to the Dáil. He is currently the Sinn Féin Chief Whip in Leinster House and is spokesperson on Housing, Justice, Equality and International Affairs. He was previously the Sinn Féin representative on the National Forum on Europe and the party's spokesperson on the Nice Treaty. He was a member of the Dáil Committee on Procedures and Privileges and the Committee on European Affairs in the 29th Dáil.
Having secured his teaching degree, Aengus went on to teach at secondary level and as a literacy teacher in Dublin's inner city. He is also the editor of Fealsúnacht, Feall agus Fuil which is a collection of historical essays concentrating on the 1798 Rebellion and several pamphlets on aspects of Irish republican history.
He has been a member of the Sinn Féin national executive, the Ard Chomhairle, for many years, and has been on the Dublin executive of the party since 1985 and was part of the party's negotiations team during the unfolding peace process.<p></p>