Joe Cirincione understands the problem of nuclear weapons better than most. He has worked on nuclear weapons policy in Washington, D.C., for more than 35 years. He also understands how political power works in the United States from the inside. He spent nine years as a professional staffer on the U.S. House of Representatives committees on Armed Services and Government Operations. He is a member of the Council on Foreign Relations and a former member of the International Security Advisory Board for secretaries of state John Kerry and Hillary Clinton. Today, he heads the Ploughshares Fund, a global security foundation, and teaches at the Georgetown University Graduate School of Foreign Service.