Ludwig Josef Johann Wittgenstein ( VIT-gən-s(h)tyne; German: [ˈluːtvɪç ˈvɪtɡn̩ˌʃtaɪn]; 26 April 1889 – 29 April 1951) was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.From 1929 to 1947, Wittgenstein taught at the University of Cambridge. In spite of his position, during his entire life only one book of his philosophy was published, the relatively slim 75-page Tractatus Logico-Philosophicus (1921). In addition to this publication, the only other works published were an article, "Some Remarks on Logical Form", (1929), a book review and a children's dictionary. His voluminous manuscripts were edited and published posthumously. The first and best-known of this posthumous series is the 1953 book Philosophical Investigations.
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