


Heidegger's work, an ontological investigation through the lens and method of Husserlian phenomenology (Edmund Husserl was Heidegger's teacher), initiated Sartre's own philosophical inquiry. While a prisoner of war in 19, Sartre read Martin Heidegger's Being and Time (1927).

L'etre et le neant, essai d'ontologie phenomenologique = Being and Nothingness, Jean-Paul Sartreīeing and Nothingness: An Essay on Phenomenological Ontology, sometimes subtitled A Phenomenological Essay on Ontology, is a 1943 book by the philosopher Jean-Paul Sartre, in which the author asserts the individual's existence as prior to the individual's essence and seeks to demonstrate that free will exists.
