Pierre-Yves Le Traon, oceanographer, is the scientific director of Mercator Ocean and research director at Ifremer. He is in charge of the scientific direction of Mercator Ocean and of the Copernicus Marine Environment Monitoring Service. As part of his Ifremer activities, he coordinates the French Investissement d’Avenir NAOS (Novel Argo Ocean Observing System) project and chairs the council of the European research infrastructure Euro-Argo ERIC. He is member of the board of EuroGOOS and of the international Argo steering team. P.Y. Le Traon was co-chairing the operational oceanography international experiment GODAE. His is expert for satellite oceanography missions for space agencies (CNES, ESA, Eumetsat) and is member of the ESA Earth Science Advisory Committee. P.Y. Le Traon is author or co-author of more 100 publications in international peer reviewed literature. He received in 2012 the European Geophysical Union Fridtjof Nansen medal.