A series of six virtual roundtables will explore how 21st Century innovation might accelerate progress toward the eventual eradication of nuclear weapons and the threats posed by nuclear materials. The Reinvent Nuclear Security series will use group video to capture live discussions among some of the most knowledgable and innovative people in the country, and it will be open for the public to ask questions and share ideas. The live roundtables are being organized by N Square, a nuclear security collaborative among five of the largest peace and security funders in the United States: MacArthur, the William and Flora Hewlett Foundation, Skoll Global Threats Fund, Ploughsares Fund, and the Carnegie Corporation of New York. The goal of the series is to surface new ideas, or combine existing ideas in new ways, to reinvigorate the conversation about nuclear security. N Square is committed to developing and providing seed funding for some of the most promising ideas that arise in Reinvent Nuclear Security Series and other programs.