Ludwig Wittgenstein

Ludwig Josef Johann Wittgenstein was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. He is considered by some to be the greatest philosopher of the 20th century.

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 75-page Logisch-Philosophische Abhandlung (Logical-Philosophical Treatise) (1921), which appeared, together with an English translation, in 1922 under the Latin title Tractatus Logico-Philosophicus. His only other published works 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. A survey among American university and college teachers ranked the Investigations as the most important book of 20th-century philosophy, standing out as "the one crossover masterpiece in twentieth-century philosophy, appealing across diverse specializations and philosophical orientations".

Wittgenstein's mother was Leopoldine Maria Josefa Kalmus, known among friends as Poldi. Her father was a Bohemian Jew and her mother was Austrian-Slovene Catholic – she was Wittgenstein's only non-Jewish grandparent. She was an aunt of the Nobel Prize laureate Friedrich Hayek on her maternal side. Wittgenstein was born at 8:30 PM on 26 April 1889 in the "Villa Wittgenstein" at what is today Neuwaldegger Straße 38 in the suburban parish Neuwaldegg [de] next to Vienna.