Louis-Charles Sirois was admitted to the Quebec Bar in 1983.
He began his career in the regional office of the Federal Department of Justice in Montreal as one of the Crown attorneys as well as a litigator in the civil litigation section.
Returning to his hometown of Ottawa in 1984, and throughout his forty-year legal career, he worked in numerous legal services departments.
He began in government procurement-contract law, then in international sales and financing, followed by copyright licensing, patent licensing and in bankruptcy and insolvency law (Proposals). He is one of the founding members of the DOJ Centre of expertise in Procurement Law.
As a University Professor he began his teaching career in 1992. He taught commercial law, administrative law and business law to accounting students at the University of Quebec for 30 years. He also provided lectures in business corporations law for 25 years at the École du Barreau du Québec.
Today he is a professor at the Faculty of Law - Civil Law Section of the University of Ottawa, where he teaches Bankruptcy Law to students in both Common Law and Civil Law sections of the faculty of law.
He also lectures in Contracts 101 as well as Contractual remedies, as well as civil liability. He also lectures in Consumer Protection Legislation as well as in Business Law.
Me Sirois was also a member of the Congress Committee of the Barreau du Québec, for three years, having been invited to this organizing committee by three different Bâtonniers. He was appointed chairman of this committee in 2010. He remains a member of the Quebec Bar as of 2020-2021.