This is a concise, yet comprehensive, introduction to one of the most influential figures in modern history: Karl Marx. Giving a balanced and jargon-free account of Marx's impact on both the philosophical and political landscapes, this indispensible guide provides a full examination of both the young and mature Marx, and surveys all his major works. It concludes with a discussion of how Marxism has changed since its founder's death and the philosopher's continuing influence on the 21st century.