Olivier Jaillon is a Principal Investigator at CEA–Genoscope. He develops and applies comparative genomic approaches to understand eukaryotic genome evolution, from genome architecture constraints to macro-evolutionary transitions such as whole-genome duplications across major lineages. He now leads “Seascape Genomics” efforts that couple environmental genomics with oceanographic context to model the large-scale organization and stability of plankton communities, and to anticipate their reorganization under climate change. He supervises PhD students, postdoctoral researchers, and trainees in interdisciplinary projects bridging genomics, ecology, and quantitative modeling.