Marius has been a trainer for nearly 20 years and a community organizer for 8 years in Cameroon. He is co-founder and coordinator of the community organization OnEstEnsemble (WeAreTogether). He has helped communities (residents of precarious neighborhoods, residents living near multinationals) in cities and the countryside to organize to defend their interests with local and international decision-makers and multinational agricultural companies, by going door-to-door neighborhood by neighborhood and through villages, conducting surveys, training leaders, creating citizen groups and conducting campaigns. He has led many non-violent citizen actions that have resulted in victories for the people, such as roads, access to electricity and water, and land protection.