Chronicling the entire span of philosophy in the Western world, Russell's classic tome includes the work of ancient thinkers such as Socrates, Plato, and Aristotle, as well as modern geniuses such as Descartes, Kant, and Marx. It also includes intimate chapters regarding the philosophers with whom Lord Russell himself was most closely associated-- Cantor, Frege, and Whitehead, coauthor with Russell of the monumental Principia Mathematica.