Donald Davidson has contributed to many subjects in contemporary philosophy. He was one of the most influential Anglo-American analytical philosophers in the late 20th century. His leading topics are the theory of meaning, the philosophy of action and the theory of mind. His claim is to give a Unified Theory of Thought, Meaning, Action, and Evaluation as a new foundational account of language. In the history of his work emerged an overall view of mind and its relation to the world. This approach argues for a total revision of the Cartesian tradition and of traditional empiricism in epistemology. This book systemizes his philosophy and refers to the critiques of his theory of meaning, action, and mind since the 1970s years. It is not fixed what Davidson's place in the history of philosophy will be, but many patterns of philosophical thought in the last fifty years would not have been without him.