Séverin is an OSM contributor since January 2010 and has been implementing programs since 2011 to create and support OSM communities in the Global South, training in OSM and free geomatics, and mapping territories in over 20 countries. He first acted with the Humanitarian OpenStreetMap Team and then through the collective that has become Les Libres Géographes, of which he is one of the founders. In the past, he was also member of the UN Mappers Crowdsourcing team, taking charge of training and the content of he UN Maps Learning Hub. He volunteers for WeeklyOSM and the OSM Foundation blog.