Li Da (1890?1966) was one of China's most important Marxist intellectuals and a founding member of the Chinese Communist Party. He played a major role in the introduction of Marxist philosophy and theory to China and in its dissemination among Chinese revolutionaries. His works are now regarded in China as classics of Marxist philosophy, and he is numbered among the ten most influential Chinese intellectuals of this century. Yet, almost nothing has been written about Li Da in English. In this seminal study, Knight analyzes Li Da's contribution to the flowering of Marxist philosophy and theory in China, examining Li's writings and placing them in the context of the Marxist tradition. Knight also explores Li Da's philosophical relationship with Mao Zedong, who was heavily influenced by Li's works. Through the lens of Li's life and thought, this book provides a detailed assessment of the introduction and dissemination of Marxist philosophy and social theory in China.