After earning a degree in international business, Mathieu obtained a master's in international relations from Sciences Po Grenoble. His career combines theory and fieldwork, with several years of expatriation in Niger and collaborations with civil society organizations across twenty African and European countries. This immersion has allowed him to refine his expertise in political and social dynamics. He joined Tournons La Page in 2019 as a protection officer before becoming program manager in 2022 and executive director in 2023. Based in Paris, he oversees the movement's initiatives for democracy and fundamental rights. Passionate about justice and civic engagement, he leverages his experience to promote a more open and inclusive society.