Mathieu is an Associate lawyer at Smith Neufeld Jodoin law offices in Steinbach. Mathieu and his wife are proud community members in Steinbach. Mathieu is a Deputy Commissioner for the Residential Tenancies Commission and serves on multiple boards including the Law Society of Manitoba, the Ste. Anne Curling Club, Sara Riel Foundation and Sara Riel Incorporated, on which he is the Chairperson.