Kenneth WaltzKenneth Waltz (19242013) is perhaps the most enduringly influential figure in international relations theory of the second half of the twentieth century. He is considered the father of the structural realist or neorealist school, and his views on core questions, such as the causes of war and the structure of the international system, are foundational to the field today and likely will remain so for decades to come. Waltzs writings on both theoretical