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I am a CNRS Directeur de Recherche biogeochemist at the Ecole Normale Supérieure de Lyon. My work primarily concerns the use of isotopes to study biological and paleoenvironmental processes. These studies include metals isotopic fractionation in living systems to investigate normal metabolism and highlight pathological disorders. Collaborations with industrial partners help to develop these interdisciplinary studies. Stable isotopes of metals are also measured in fossils to study past biological processes and reconstruct past trophic chains and their environments. I also have expertise in Quaternary dating methods using radioactive U/Th/Pb method.