Being and Nothingness Being and Nothingness Being and Nothingness: An Essay on Phenomenological Ontology (), sometimes published with the subtitle 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 ("existence precedes essence") and seeks to demonstrate that free will exists. While a prisoner of war in 1940 and 1941, Sartre read Martin Heidegger's "Being and Time" (1927). 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 enquiry. Though influenced by Heidegger,
Chamaeleon (philosopher) Diogenes Laërtius says, that Chamaeleon accused Heraclides Ponticus of having stolen from him his work concerning Homer and Hesiod. The above works were probably both biographical and critical. He also wrote works entitled περὶ θεῶν, and περὶ σατύρων, and some moral treatises, περι ἡδονῆς (which was also ascribed to Theophrastus), προτρεπικόν, and περι μέθης. Of all his works only a few fragments are preserved by Athenaeus and other ancient writers. Chamaeleon (philosopher) Chamaeleon (or Chameleon; ; c. 350 – c. 275 BC), was a Peripatetic philosopher of Heraclea Pontica. He was one of the immediate disciples of Aristotle. He wrote