This book provides a critical overview of the entirety of Marcuse's work and discusses his enduring importance. Kellner had extensive interviews with Marcuse and provides hitherto unknown information about his road to Marxism, his relations with Heidegger and Existentialism, his involvement with the Frankfurt School, and his reasons for appropriating Freud in the 1950s. In addition Kellner provides a novel interpretation of the genesis and structure of Marcuse's theory of one-dimensional society, of the development of his political theory, and of the role of aesthetics in his critical theory.