Who am I? What is justice? What does it mean to live a good life? From the metaphysics of Plato to the nihilism of Nietzsche, this engaging and accessible book invites readers to contemplate the ideas of 100 key philosophers within the Western intellectual tradition. Covering philosophical, scientific, political and religious thought over a period of 2500 years, 100 Great Philosophers Who Changed the World serves as an excellent guide to this history of philosophy and the progress that has been made in interpreting the world around us. These figures include: * Aristotle * Jean-Jacques Rousseau * Karl Marx * Simone de Beauvoir * Noam Chomsky * W.V.O Quine By presenting details of their lives and the concerns and circumstances that motivated them, this book makes philosophy come to life as a relevant and meaningful approach to thinking about the contemporary world.