Hélène Morlon is a research director at the CNRS and head of the Biodiversity Modeling team at the Institute of Biology of the ENS-PSL (IBENS). The objective of her work? To better understand how past environmental changes have influenced biodiversity and vice versa, in order to understand current environmental changes. This innovative research, at the crossroads of mathematics and biology, has earned her the prestigious CNRS silver medal in 2021.