The publication For Marx and Reading Capital established Louis Althusser as one of the most controversial figures in the Western Marxist tradition, and one of the most influential renewals of Marxist thought. Collected here are Althusser s most significant philosophical writings from the late sixties and through the seventies. Intended to contribute, in his own words, to a left-wing critique of Stalinism that would help put some substance back into the revolutionary project here in the West, they are the record of a shared history. At the same time they chart Althusser s critique of the theoretical system unveiled in his own major works, and his developing practice of philosophy as a revolutionary weapon . The collection opens with two lucid early articles Theory, Theoretical Practice and Theoretical Formation and On Theoretical Work . The title piece Althusser s celebrated lectures in the Philosophy Course for Scientists is the fullest exploration of his new definition of philosophy as politics in the realm of theory, a conception which is further developed in Lenin and Philosophy . Is it Simple to be a Marxist in Philosophy provides an invaluable account of Althusser s intellectual development. The volume concludes with two little-known late pieces The Transformation of Philosophy, in which the paradoxical history of Marxist philosopher is investigated; and Marxism today, a sober balance-sheet of the Marxist tradition. Attesting to the unique place that Althusser has occupied in modern intellectual history between a tradition of Marxism that he sought to reconstruct, and a post-Marxism that has eclipsed its predecessor these texts are indispensable reading.