In 1945, world leaders gathered in San Francisco to sign the United Nations Charter, which laid the blueprint for today's international system. The institutional architecture that was built around the United Nations, including its specialized agencies (such as the World Bank and World Health Organization) and funds and programs (such as the United Nations Children's Fund (UNICEF) and the UN High Commissioner for Refugees (UNHCR)), survived the Cold War and seemed to have hit its stride in the immediate post-Cold War era. Yet the global distribution of power has changed, states are no longer the sole actors in international affairs, and the very idea of global governance is being called into question. Not surprisingly, there is much questioning of whether the institutional architecture that was built almost seventy-five years ago is still fit for purpose. Policymakers are rightly focused on reform of that architecture. Rather than tinkering at the margins, this panel was conceived with a more radical agenda. If the UN did not exist today, would we create it? If so, what would it look like?