Tatiana Giraud is Director of Research at the CNRS, member of the French Academy of Sciences, lecturer at the École Polytechnique, deputy director of the Écologie systématique évolution unit (Université Paris-Saclay, CNRS, AgroParisTech), CNRS silver and bronze medals, Research prize of the Société française d'écologie et évolution, prize of the Fondation Louis D. Institut de France, responsible for 3 ERC projects and 174 publications in scientific journals.

She studies the diversity of fungi and plants, and the evolutionary mechanisms that enable organisms to evolve, diversify and adapt to their environment. These are fundamental questions for understanding the living world, and this research has applications in trying to prevent the consequences of current global changes. Her work has led to a better understanding of how new plant diseases emerge in natural and agricultural ecosystems.

Tatiana Giraud uses different species of fungi and domesticated plants as biological models to understand the response of organisms to strong selection pressures for rapid adaptation. She has studied the adaptation mechanisms of mushrooms used for cheese ripening. Her work on domesticated species has also revealed the sequence of genetic events at the origin of the cultivated apple tree, involving hybridizations with wild apple trees.