Career
Born in L"Islet-sur-Mer, Quebec, Canada, Giasson was ordained to the priesthood in 1965 with the Société des Missions-Étrangères in Laval, Quebec. Following his ordination, Giasson went to Honduras as a missionary in 1966 and in 2003 he became regional superior for the Society in Honduras. In 2005 after 48 years as a priest, he was appointed by Pope Benedict XVI the first bishop of the Roman Catholic Diocese of Yoro, Honduras.
He resigned on January 21, 2014 and died less than a month after retiring.