Archbishop Gallagher was born in Liverpool, Great Britain on 23 January 1954. He was ordained a priest for the Archdiocese of Liverpool on 31 July 1977. Having gained a doctorate in Canon Law, he entered the diplomatic service of the Holy See on 1 May 1984, serving in the Apostolic Nunciatures in Tanzania (1984-1988), Uruguay (1988-1991), the Philippines (1991-1995) and subsequently as an official of the Section for Relations with States of the Secretariat of State (1995-2000). On 15 July 2000, he was appointed Special Envoy and Permanent Observer of the Holy See to the Council of Europe at Strasbourg. On 22 January 2004, he was appointed titular Archbishop of Hodelm and Apostolic Nuncio to Burundi, succeeding Archbishop Michael Aidan Courtney, who had been assassinated in an ambush on 29 December 2003. On 13 March 2004, he was ordained a bishop. After 5 years of service as Apostolic Nuncio in Burundi, he was appointed Apostolic Nuncio to Guatemala on 19 February 2009. On 11 December 2012, he was appointed Apostolic Nuncio to Australia. Since 8 November 2014, he has held the position of Secretary for Relations with States and International Organisations.
Secretary for Relations with States of the Holy See