Bernard HUBERT, Senior scientist at the National Institute for Agricultural Research (Institut National de Recherche Agronomique, INRA) and Professor at the Advanced School for the Social Sciences (Ecole des Hautes Etudes en Sciences Sociales, EHESS), trained as an ecologist (his thesis study concerned functional ecology in Western Africa), but his work has broadened as he has questioned the role of human activities in this setting, seeking to understand the contribution of the social sciences to issues in the life sciences.