Mathias has a broad litigation practice, focusing on corporate law and corporate litigation matters. Since joining the litigation practice group, he has represented various clients in proceedings before Dutch courts and the Enterprise Chamber in Amsterdam, including in summary proceedings, inquiry proceedings and appeal in cassation proceedings.

Before joining De Brauw's litigation practice group, Mathias advised clients on complex corporate and governance-related matters, including national and international mergers, acquisitions and IPOs in De Brauw's corporate practice group.