Plato (c.427-347 BC) stands with Socrates and Aristotle as one of the shapers of the whole intellectual tradition of the West. He founded the Academy in Athens, the first permanent institution devoted to philosophical research and teaching, and theprototype of all Western universities. Plato wrote over twenty philosophical dialogues. Thomas Kjeller Johansen studied philosophy and classics at Trinity College, Cambridge. He is now University Lecturer in Ancient Philosophy at Oxford University and Tutorial Fellow of Brasenose College, Oxford. His publications include Platos Natural Philosophy: A Study of the Timaeus-Critias (Cambridge 2004).