Stephen M. Walt is a renowned columnist for Foreign Policy and the Robert and Renée Belfer Professor of International Relations at the Harvard Kennedy School. A leading scholar in foreign policy theory and U.S. grand strategy, Walt is best known for his work on realism, alliance politics, and international security. His influential books include The Origins of Alliances, Taming American Power, The Israel Lobby and U.S. Foreign Policy, and International Relations: One World, Many Theories. Walt’s writing and commentary challenge conventional wisdom and shape debates on America’s role in the world.