Hervé Claustre earned his PhD in 1987 from the Pierre and Marie Curie University (now Sorbonne University), became a CNRS Research Associate (1990), then CNRS Senior Scientist (2001) at the “Laboratoire d’Océanographie de Villefranche”. His research is dedicated to the development of interdisciplinary approaches at the frontiers of marine biology, chemistry and optics for the study and understanding of biogeochemical processes ranging from small to global scales. In 2004, he led the Biogeochemistry and Optics South Pacific Experiment (BIOSOPE) project dedicated to the exploration of the poorly known waters of the South Pacific Subtropical gyre. For more than 15 years, Hervé Claustre has been investigating biogeochemical processes at presently unresolved scales or in remote open ocean areas. Accordingly, a large part of his effort is dedicated to the development of new observational techniques based on gliders and profiling floats. He is presently the co-chair of the international BGC-Argo program (http://biogeochemical-argo.org) whose main objective is the operation of a sustained array of profiling floats supporting the global observation of marine biogeochemistry in the context of an ocean under increasing anthropogenic pressure. Hervé Claustre has contributed to more than 170 articles in international peer-reviewed journals. He was awarded the CNRS silver medal in 2005 and two advanced grants from the European Research Council, one in 2010 for the “remotely sensed biogeochemical cycles in the Ocean” (remOcean) project (http://remocean.eu) and one in 2019 for the "Robotic Exploration of plankton-driven Fluxes in the marIne twilight zoNE (REFINE) project (https://erc-refine.eu). He is particularly involved in projects dedicated to increase ocean literacy.