A.J. Ayer, FBA (October 29, 1910 – June 27, 1989) was a British philosopher known in particular for his contributions to logical positivism, especially in his books Language, Truth, and Logic (1936) and The Problem of Knowledge (1956). When he published Language, Truth, and Logic at 26 he became the "enfant terrible" of British philosophy because his logical positivism leaned on the concept developed by the Vienna Circle. In this book, Ayer asserted that without logical or positive verification statements cannot be true or untrue. Ayer was an Honorary Associate of the Rationalist Press Association from 1947 until his death. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1963 and in 1965 he became the first president of the Agnostics' Adoption Society and in the same year succeeded Julian Huxley as president of the British Humanist Association, a post he held until 1970. He was was awarded a Knighthood as Knight Bachelor in the London Gazette on January 1, 1970. Ayer was also good at sports and played rugby for Eton, and was also a noted cricketer and a keen supporter of the Tottenham Hotspur football team. Ayer is featured as most likely autistic (Asperger's Syndrome) in The Genesis of Artistic Creativity by Michael Fitzgerald. Read more about his extraordinary life, his ideas and his publications on his Wikipedia page.