Archbishop Kieran O’Reilly SMA will be the chief celebrant during the RTE televised Mass on Sunday, 22nd October 2017, to mark Mission Sunday.
Kieran is Archbishop of Cashel & Emly. He was born in Cork on 8 August 1952 to Seán and Theresa O’Reilly and was educated at Scoil Chríost Rí and Coláiste Chríost Rí, before he entered the Society of African Missions in Wilton, Cork, in 1970.
Archbishop Kieran was ordained for the Society on 17 June 1978 and served in Liberia for two years before studying for a licentiate in Sacred Scripture at the Pontifical Biblical Institute in Rome. From 1984 to 1989 he lectured in Scripture at the Major Seminary of SS. Peter and Paul, in Ibadan, Nigeria. From 1989-2010 he served on the Irish and General Councils of the Society of African Missions. In May 2010, during his second term as SMA Superior General, Kieran was appointed, by Pope Benedict XVI, as Bishop of Killaloe.
As SMA Superior General [2001 – 2010] and as bishop of Killaloe, he attended three Synods of Bishops in Rome: Synod on the Word of God in the Life and Mission of the Church , Second Special Assembly for Africa  and the Synod on the New Evangelization for the transmission of the Christian faith . Bishop Kieran is a member of the Vatican Congregation for Institutes of Consecrated Life and Societies of Apostolic Life.
The Archdiocese of Cashel & Emly and the Archdiocese of Armagh are the original Irish Ecclesiastical Provinces, dating back to a request in the early 12th century by Saint Malachy. Dublin and Tuam were established later