Erich Fromm (1900 - 1980) is widely regarded as one of the most important psychoanalytical thinkers of the 20th century. Besides his influence on modern psychology, he was also a key member of the Frankfurt School, and became one of the founders of the socialist humanist movement. In publishing Marx's Concept of Man in 1961, Fromm presented to the English-speaking world for the first time Karl Marx's then recently discovered Economic and Philosophical Manuscripts. Including the Manuscripts and many other philosophical writings by Marx as well as Fromm's own extended response, many of these writings have since become recognised as important works in their own right. Fromm stresses Marx's humanist philosophy and challenges both contemporary Western ignorance of Marx and Soviet corruptions of his work. Fromm's analysis of Marx's work and his dissemination of these neglected writings by Marx himself fundamentally altered the prevailing discourse about Marxism, revolutionising contemporary thought and providing a formative influence for the development of the New Left.