William Terrence McGrattan is the eighth and current bishop of the Diocese of Calgary. He was an auxiliary bishop for the Archdiocese of Toronto and titular bishop of Furnos Minor before being appointed Bishop of the Diocese of Peterborough.

St. Peter's Seminary is a Roman Catholic seminary located in the Diocese of London, Ontario, Canada. The seminary is a fully accredited member of the Association of Theological Schools of the United States and Canada. St. Peter's Seminary is the major seminary of the Roman Catholic Diocese of London in Ontario. It is affiliated with King's University College, a Catholic affiliate of the University of Western Ontario. The current rector of St. Peter's Seminary is Denis Grecco.