This text brings together in one volume, and in chronological order, a selection of titles from Weidenfeld and Nicolson's series "The Great Philosophers": Anthony Gottlieb on Socrates, Bernard Williams on Plato, John Cottingham on Descartes, Roger Scruton on Spinoza, David Berman on Berkeley, Anthony Quinton on Hume, Terry Eagleton on Marx, Jonathan Ree on Heidegger, Peter Hacker on Wittgenstein, Andrew Hodges on Turing, Ray Monk on Russell and Frederic Raphael on Popper.