Guillaume Leduc is a paleoceanographer and organic geochemist specializing in tropical palaeoclimatology and proxy interpretation, and Researcher at the French National Centre for Scientific Research (CNRS-CEREGE). CEREGE is a joint research center (UM 34) incorporating Aix-Marseille University (AMU), the CNRS (UMR7330), the IRD (UMR 161), the Collège de France, and INRAE. His research has focused on reconstructing different parameters in many oceanic regions from the Pliocene to the last centuries, as well as developing and applying geochemical tools for tropical paleo-precipitation reconstructions. Most of his research attempts to understand how past, present and future changes in tropical seasonality and interannual climate variability associated with the El Niño phenomenon interact in the tropical Pacific. Recently, he contributed to identify Holocene changes in climate variability and confront them to shifts identified in Neolithic societies in Europe, Egypt and the Persian Gulf.