Realism theory in international relations is most closely associated with which personality?

Hans J. Morgenthau is most closely associated with Realism theory in international relations. His seminal work, "Politics Among Nations," published in 1948, laid the foundation for classical realism, emphasizing that states are the primary actors, driven by self-interest and the pursuit of power in an anarchic international system. Morgenthau's six principles of political realism remain highly influential in understanding global politics.

• John Locke and Immanuel Kant are foundational thinkers for liberal and idealist traditions, focusing on cooperation and moral principles. Thomas Hobbes's ideas on human nature influenced realism, but Morgenthau is the direct and most prominent figure in IR theory for classical realism.