A. J. Ayer

English philosopher and advocate of logical positivism

Sir Alfred Jules Ayer was an English philosopher who became famous at age 26 for his book Language, Truth, and Logic (1936).^[1][2] From 1965 to 1970, Ayer served as the second president of the British Humanist Association, an organization he was known for advocating for.^[3] Ayer had a strong interest in sports; he played rugby while at Eton and held a season ticket for many years as a supporter of Tottenham Hotspur.^[4]

Last updated 2026-09-30 from the source article.

Quick Facts

Birth name: Alfred Jules Ayer
Born: 29 October 1910
Birthplace: St. John's Wood, London, England
Died: 27 June 1989
Place of death: London, England
Alma mater: Christ Church, Oxford
Era: 20th-century philosophy
Region: Western philosophy

Facts from the source article.

Life and work

Ayer was born in St John's Wood, London, to a Swiss Calvinist father and a mother from the Dutch-Jewish family that founded Citroën.^[5] He boarded at Ascham St Vincent's School from age seven and later attended Eton as a King's Scholar, where he excelled in classics and rugby.^[6] After studying at Oxford, Ayer spent the winter of 1932–1933 in Vienna with Moritz Schlick and the Vienna Circle.^[7][8] He lectured at Christ Church, Oxford from 1933 to 1940, then served as an officer in the Welsh Guards and worked for SOE and MI6 during the Second World War.^[7][9][10]

Ayer was married four times to three women, including a remarriage to his fourth wife shortly before his death.^[11][12] He died on 27 June 1989, and a memorial plaque was unveiled at his Marylebone home in 1995.^[13] Following the war, from 1946 until 1959, Ayer held the position of Grote Professor of the Philosophy of Mind and Logic at University College London.^[7][4] At New College, Oxford, Ayer occupied the Wykeham Chair of Logic, a professorship he retained from 1959 until his retirement in 1977/1978.^[7][14]

What the cited sources add

The Stanford Encyclopedia of Philosophy notes that Ayer was only 24 when he wrote Language, Truth, and Logic.^[8] The same source states that Ayer's uncertain knowledge of German limited his philosophical experience in Vienna.^[8] Seven boxes of research materials, compiled by Ayer's biographer Ben Rogers during his writing process, were placed at University College London in 2007 with the family's consent.^[15]

References

Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: "Ayer". Random House Webster's Unabridged Dictionary.; Quinton, "Biographical Dictionary of Twentieth-Century Philosophers", Routledge, 1996, p. 37–39 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Rogers, "A.J. Ayer A Life", Vintage, 1999; Rogers, "A.J. Ayer A Life", Vintage, 1999; Rogers, "A.J. Ayer A Life", Vintage, 1999 (we also read that source) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: "Humanist Heritage: A.J. Ayer (1910-1989)", Humanist Heritage; Lyons, "Isaiah Berlin and his Philosophical Contemporaries", Springer Nature, 2021, p. 33 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Radio Times article by Tim Heald, 20–26 August 1977 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Rogers, Ben, "A.J. Ayer: A Life", Vintage, 2000; Anthony Quinton, Alfred Jules Ayer. Proceedings of the British Academy, 94 (1996), pp. 255–282.; Pace, "A. J. Ayer Dead in Britain at 78; Philosopher of Logical Positivism", The New York Times, 29 June 1989 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Rogers, Ben, "A.J. Ayer: A Life", Vintage, 2000, p. 42–44 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Macdonald, "Alfred Jules Ayer", The Stanford Encyclopedia of Philosophy, 2025 (we also read that source) en.wikipedia.org
Macdonald, "Alfred Jules Ayer", The Stanford Encyclopedia of Philosophy, 2025. facts only, no text reused. plato.stanford.edu
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Norton-Taylor, "Graham Greene, Arthur Ransome and Somerset Maugham all spied for Britain, admits MI6", The Guardian, 21 September 2010 (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: ; "The worst crime was to be a bore the Spectator", 2 July 2011; Pace, "A. J. Ayer Dead in Britain at 78; Philosopher of Logical Positivism", The New York Times, 29 June 1989; ; (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: ; (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: "City of Westminster green plaques" (original not read by us) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: Rogers (1999), p. 344.; Wells, "The house in France : a memoir", Alfred A. Knopf, 2011, p. 258 (we also read that source) en.wikipedia.org
Wikipedia, "A. J. Ayer" (CC BY-SA 4.0), which cites: UCL Special Collections, "Ayer (Rogers) Papers", UCL Archives Catalogue; UCL Special Collections, "Ayer (Rogers) Papers", UCL Archives Catalogue (original not read by us) en.wikipedia.org

Each numbered sentence above was checked against the source it cites before publication. Sentences citing Wikipedia adapt text from the English Wikipedia article A. J. Ayer (contributors), used under CC BY-SA 4.0; this entry is available under the same licence. Other sources were used for facts only; no text or images are copied from them.