During his university studies, Mathis has been quite active in student life. He was the First-Year Representative for the Labour Law Committee during the 2023-2024 academic year. Subsequently, he was elected Co-President of the Business Law Committee, a role that allowed him to introduce students to the business world. Prior to that, Mathis explored various areas of practice, in particular the field of criminal law, in which he had the opportunity to learn about a broad variety of cases.

Mathis will continue to be active in student life in his last year of university as Co-President of th Business Law Committee at the Quebec University at Montreal.