Feminist and existentialist philosopher known for writing She Came to Stay and The Mandarins and her treatise The Second Sex from 1949.
She used to sit in on classes at École Normale Supérieure to study for the agregation exam for philosophy.
She was influenced by Friedrich Nietzsche.
She studied mathematics at Institut Catholique and literature at Institut Sainte-Marie.
She was married to Jacques-Laurent Bost.