Bishop Desrochers was born in 1956 in the Hull sector of Gatineau, Québec. Upon completion of secondary school, he entered Algonquin College, Ottawa, to pursue studies in Fine Arts and Commercial Art which, in turn, led him to work as a graphic artist for seven years with the Ottawa French-language newspaper Le Droit.
He later entered the Congregation of the Most Holy Redeemer (Redemptorists) to pursue his vocation and was ordained to the priesthood in 1989.
Following his ordination, he worked on a special evangelization project in the Gaspé region of Québec. He went on to serve for several years as Rector of the former Redemptorist monastery in Aylmer-Gatineau, before being appointed to the Shrine of Saint Anne-de-Beaupré. After a brief period as superior of a retirement home for Redemptorists near Québec City, he returned to Saint Anne-de-Beaupré as director of the Annals of Saint Anne magazine, serving in that capacity for three years and, in July 2011, became Rector of the Basilica Shrine of Saint Anne-de-Beaupré. He devoted part of his time to preaching retreats all over North America and, in June 2015, returned to this ministry in a full-time capacity as well as serving as Director of Vocations for the Redemptorists.
He was appointed Auxiliary Bishop of the Diocese of Alexandria-Cornwall of Ottawa on 12 December 2018 and ordained Bishop at Alexandria on 22 February 2019. Bishop Desrochers has subsequently worked closely with the Most Reverend Terrence Prendergast, S.J., the then Bishop of the Diocese of Alexandria-Cornwall and Archbishop of Ottawa, both of which were then united in persona episcopi.
On May 6, 2020, His Holiness Pope Francis appointed Bishop Desrochers, Bishop of the Diocese of Pembroke. On July 3, 2020, Bishop Desrochers will be installed as the ninth bishop of Pembroke.