 He was fired from his posts at Quebec following the cholera epidemic of 1832; this may have been at least partly due to Tessier's politics.In 1831, Tessier was elected to the Quebec boards of medical examiners.He was elected to the Legislative Assembly of Lower Canada for Saguenay in an 1833 by-election held after the death of Joseph-Isidore Bédard; he was reelected in 1834.