Gustave Massiah is an engineer, economist, and former professor at the Ecole Nationale Supérieure d'Architecture de Paris la Villette. He was a founding member of CEDETIM (Centre d'études et d'initiatives de solidarité international), a global solidarity organization, and Secretary General of the International League for the Rights and Liberation of Peoples. He has been a prominent voice in the alter-globalization movement, serving as the president of CRID (Centre de recherche et d'information sur le développement) from 2000 to 2008 and vice president of ATTAC from 2001 to 2006. He is a founding member of the IPAM network (Initiatives for Another World) and is on the International Council of the World Social Forum. In 2011, he published Une stratégie altermondialiste.