Olivier Cohen is assistant professor at the Department of Geography and at the Oceanology and Geosciences Laboratory, Université du Littoral Côte d'Opale (ULCO). He does research in coastal geomorphology. His main current project is '« Quel littoral dans cinquante ans ? Co-construction de stratégies d’adaptation au changement climatique en Côte d’Opale». He is in charge monitoring of the east of Dunkirk site as part of the DYNALIT National Observation Service.