Mathieu holds a master’s degree (M.A.) in international environmental relations from the Institut universitaire des hautes études internationales (Switzerland) and another master’s (M.Sc.) in environmental technology from Imperial College (England). In the course of his career he has been employed at the Secretariat of the Convention on Biological Diversity of the United Nations Environment Programme, with oikos International, and at the Royal Institute of International Affairs. He has collaborated with the Biosphère for some 15 years, first as a museology consultant and then as Principal Advisor, Communications and exhibits.