[1] He was educated at local schools in Saint-Nazaire-de-Dorchester before finishing his studies at Collège de Lévis.
He later graduated with two degrees from Laval University, becoming a certified secondary school teacher.
[1] Lachance taught at Polyvalente St-Damien from 1970-1974, moving up the ranks to become school board president, and later head of the social studies department and assistant principal, a position he held until 1981.
[1] In 1989, Lachance tried to win back his seat in the National Assembly, but was again beaten by Louise Begin.
[1] After his defeat in 2003, Lachance was again elected Mayor of Saint-Nazaire-de-Dorchester, later serving as Deputy Prefect of Bellechasse Regional County Municipality until 2007.