Agnes Heller is one of the leading thinkers to come out of the tradition of critical theory. Her awesome intellectual range and output includes ethics, philosophical anthropology, political philosophy and a theory of modernity and its culture. Hungarian by birth, she was one of the best known dissident Marxists in central Europe in the 1960's and 1970's. Since her forced immigration she has held visiting lectureships all over the world and has been the Hannah Arendt Professor of Philosophy at the New School in New York for the last twenty years. This introduction to her thought is ideal for all students of philosophy, political theory and sociology. Grumley explores Heller's early work, elaborating her relation to Lukacs and the evolution of her own version of Marxism. He examines the subsequent break with Marxism and the initial development of an alternative radical philosophy. Finally, he explains and assesses her mature reflective post-modernism, a perspective that is both sceptical and utopian, that upholds a critical humanist perspective just as it critiques contemporary democratic culture.