Pope John Paul II named Prendergast the
titular bishop of
Slebte and an
auxiliary bishop of the
Archdiocese of Toronto on 22 February 1995. and was installed on 26 June 2007. In this office, he also serves
ex officio as Chancellor of
Saint Paul University. In 2012, Prendergast welcomed a number of members of the Anglican Catholic Church of Canada into full communion with the Roman Catholic Church. He was appointed Apostolic Administrator of Alexandria-Cornwall on 13 January 2016, and became bishop there on 27 April 2018, while remaining Archbishop of Ottawa. The two dioceses were united
in persona episcopi ("in the person of the bishop"). They were then united on 6 May 2020, to form the Archdiocese of Ottawa-Cornwall, under him as archbishop. On 30 November 2020, he was appointed apostolic administrator of
Diocese of Hearst–Moosonee after the resignation of its bishop,
Robert Ovide Bourgon. On the following 4 December, he formally retired as archbishop and was succeeded by
Marcel Damphousse, the coadjutor archbishop who was appointed when the new Archdiocese of Ottawa-Cornwall was formed. Prendergast is a known supporter of the
Tridentine Mass and has collaborated on numerous occasions with the
Priestly Fraternity of Saint Peter (FSSP). He has ordained many members of the society in Canada and the United States since 2015, including the ordination of Luc Poirier in the
Notre-Dame Cathedral Basilica on 31 May 2019. After serving on the Canadian Bishops' Commission for Relations with Associations of Clergy, Consecrated Life and Laity, as a member of the CCCB Theology Commission [now known as the Doctrine Commission], its Commission on Social Communications, several terms on the Permanent Council (including since 2015 as representative of the bishops of Ontario) and earlier as co-chair of the national Anglican-Roman Catholic dialogue, Prendergast is, since October 2014, a member of the CCCB's Episcopal Liaison Committee to the Canadian Catholic Organization for Development and Peace. His other responsibilities include president of National Evangelization Teams Canada (NET Canada) and chair of CNEWA (Catholic Near East Welfare Association) Canada, both of which are based in Ottawa. Prendergast is a teacher, writer and retreat master. From 1994 to 2005, he wrote a weekly column in the
Catholic Register. A collection of his essays was published as ''Living God's Word: Reflections on the Sunday Readings for Year A, B, C''. He has been a writer or editor for several journals, and lectured and given retreats across Canada, in the United States and Rome. ==References==