Lahey served in both clerical and academic positions first in Newfoundland and Labrador, and later in Nova Scotia. • Administrator of Holy Cross Parish,
Diocese of Grand Falls,
Holyrood • Pastor of St. Peter's Parish,
Archdiocese of St. John's,
Mount Pearl • Vicar General of the
Archdiocese of St. John's,
St. John's • Assistant Professor, Department of Religious Studies,
Memorial University of Newfoundland,
St. John's • Proctor of St. John's College,
Memorial University of Newfoundland,
St. John's • Associate Professor, Department of Religious Studies,
Memorial University of Newfoundland,
St. John's • Department Head, Department of Religious Studies,
Memorial University of Newfoundland,
St. John's • Member of the Senate of Memorial University,
Memorial University of Newfoundland,
St. John's • Member of the Provincial Religious Education Committee,
Newfoundland and Labrador • Served on two Roman Catholic school boards,
Newfoundland and Labrador • Served on the Belvedere Orphanage Trust,
Newfoundland and Labrador • Vice-Chairman of the Roman Catholic 200th Anniversary Committee,
Newfoundland and Labrador (included preparations for the
1984 Papal Visit by
Pope John Paul II to the province)
Bishop • Named Bishop of the
Diocese of St. George's on 8 July 1986 by
Pope John Paul II. Consecrated on 3 August 1986 in
Corner Brook. • Named Bishop of Antigonish by John Paul on 5 April 2003. Installed there on 12 June 2003. •
Pope Benedict XVI accepted his resignation on 26 September 2009, after child pornography was discovered on his laptop. ==Academic contributions==