His areas of practice also include:
- complex commercial insolvencies
- cross-border restructuring and enforcement
- ranking of priorities
- bills of exchange and other payment instruments
Mathieu advises financial institutions, through their legal and special accounts management groups, on a wide array of issues, as well as trustees and accounting firms. He also represents banks in files involving payments systems, as well as litigation related to fraud, fraudulent transfers and the misappropriation of funds. He also advises the Canadian Bankers Association.
Mathieu has appeared before all levels of court, including the Superior Court and the Court of Appeal of Quebec, and has intervened before the Supreme Court of Canada. He also has trial experience in matters pertaining to the protection of personal information and privacy before the Federal Court and the Federal Court of Appeal.