John L. Austin

John L. Austin's most influential work is 'How to Do Things with Words,' published posthumously in 1962 based on his William James Lectures at Harvard. In it, he developed speech act theory, arguing that language doesn't just describe reality but performs actions, such as when saying 'I promise' actually constitutes a promise.

Austin initially distinguished between constative utterances, which describe states of affairs and can be true or false, and performative utterances, which perform an action and can be 'felicitous' or 'infelicitous.' He later complicated this distinction, arguing that all utterances have both descriptive and performative elements.

John L. Austin taught philosophy at the University of Oxford, where he was a leading figure in ordinary language philosophy. He served as White's Professor of Moral Philosophy at Oxford from 1952 until his death in 1960.

John Searle, who studied with Austin, expanded and systematized speech act theory, most notably in his 1969 book 'Speech Acts.' Austin's ideas also influenced pragmatics, linguistic philosophy, and communication theory, establishing language as a form of social action rather than mere representation.