Jean Ste-Marie has a Bachelor of Arts from Université Laval and a Licentiate in Laws from the University of Ottawa. After his admission to the Barreau du Québec, he practised at the federal Department of Justice for 23 years where he held several positions as Legal Advisor and Senior Manager. He then worked at the Office of the Auditor General of Canada as Senior Legal Advisor and Assistant Auditor General. He was also Interim Vice-President of the Public Service Commission of Canada.
After retiring, he accepted mandates for the Canadian International Development Agency (CIDA) in Francophone Africa, where he participated in projects on public finance. He also worked for CIDA in Asia where he worked on developing a law to establish a public service based on a Canadian model.
He sits as Vice-Chairman of the Board of Directors of Alliance française for the National Capital Region, and was appointed Queen’s Counsel (QC) in 1991.
Jean Ste-Marie has been a member of the Board of Trustees of Hôpital Montfort since 2018.