Ludwig Wittgenstein (1889-1951) was an extraordinarily original philospher, whose influence on twentieth-century thinking goes well beyond philosophy itself. In this book, which aims to make Wittgenstein´s thought accessible to the general non-specialist reader, A. C. Grayling explains the nature and impact of Wittgenstein´s views. He describes both his early and later philosophy, the differences and connections between them, and gives a fresh assessment of Wittgenstein´s continuing influence on contemporary thought.