Ludwig Josef Johann Wittgenstein, Austrian-born philosopher, mathematician. He made important contributions to modern philosophy with his studies on logic and philosophy of language. He is considered one of the most important philosophers of the 20th century. Date of birth: April 26, 1889, Vienna, Austria Date and place of death: April 29, 1951, Cambridge, United Kingdom Influenced by: Bertrand Russell, Immanuel Kant, Gottlob Frege Buildings: Haus Wittgenstein Movies: As from Afar, M.A. Numminen Sings Wittgenstein, Wittgenstein Tractatus