How are humanitarian intervention and the responsibility to protect changing in the current international political scene? In Humanitarian Intervention: Ideas in Action (3rd ed., Polity Press, 2016), Weiss explores the past, present, and future of these phenomena. The book offers a synthesis of conceptual debates, case studies, and historical analysis in exploring the constantly evolving theory and practice of humanitarian intervention. It also discusses that way that transformations in how wars are fought and in the identity and operations of humanitarian organizations impact prospects for intervention. The interview by John McMahon of the Center for Global Ethics and Politics covers the history of humanitarian intervention and the emergence of the ‘responsibility to protect’ norm, the role of the UN and of humanitarian organizations in relation to intervention, shifting understandings of sovereignty, the expansion of what is understood to constitute a threat to international peace and security, the present situation in Syria, and much more.