Justice Marcotte was born in Montreal on July 14, 1964 to the late Lisette Boissinot and Dr. Émile Marcotte.
She studied at Collège Ste-Marcelline, Collège André-Grasset (D.E.C. 1983) and she obtained a B.C.L. degree from McGill University in 1986.
Called to the Quebec Bar in 1987, she first joined the law firm of Lavery, O'Brien (now Lavery). Her practice was concentrated in civil and commercial litigation, with a speciality in civil and professional liability, and construction law.
In 1998, she joined the law firm of Heenan Blaikie where she also practiced in matters of intellectual property, marketing and advertising law and class actions.
Over the course of her career, she was involved with the Bar of Montreal, particularly with its Public Liaison Committee. In 1988, she founded the Bar of Montreal Debating Competition, of which she assumed the direction for 10 years. She also sat on the Liaison Committee with the Court of Appeal.
She was frequently invited as a lecturer by the Quebec Bar (Continuing Education), Insight and Infonex. She published several articles in civil and professional liability. For over 10 years she was a member of the Editorial Committee of the Professional Liability and Disciplinary Litigation Magazine published quarterly by Federated Press.
As an active member of the Canadian Bar Association for several years, she sat on the Executive Committee of the Civil Law and Insurance Section for the Quebec Division of which she also assumed the presidency.
She was appointed to the Superior Court on July 30, 2008 and was elevated to the Court of Appeal on April 10, 2014