|Reference style||The Right Reverend|
Delannoy was born in Comines, in the Department of Nord, the son of Jacques Delannoy, the owner of a lumber yard, and Anne-Marie Carissimo. He did his elementary education at the Institution Saint-Jude in Armentières, followed by attending the Lycée Saint Paul. Following completion of his secondary education, he studied economics at the Catholic University of Lille, ending with a Master's degree. He then worked as an accountant for four years.
At that point, Delannoy left the field and decided to seek Holy Orders. He entered the Seminary of Lille, where he pursued his training for the priesthood. He was ordained a priest on 4 June 1989 for the then-Diocese of Lille by Bishop Gérard Defois.
Delannoy then served in a parish in Roubaix for two years, after which he was made responsible for diocesan activities in independent sites (1991–1999), and in 1997 was also named the Dean of the urban district of Roubaix and of Bailleul. In 1999 he was appointed the Episcopal Vicar of the region of French Flanders, and additionally, in 2003, Dean of Houtland.
Olivier Jean-Marie Michel de Berranger
|Bishop of Saint-Denis
10 May 2009–present