William J. Perry served as Undersecretary of Defense for Research and Engineering in the Carter administration, and then as Secretary of Defense in the Clinton administration, and has advised presidents all through the Obama administration. He oversaw the development of major nuclear weapons systems, such as the MX missile, the Trident submarine and the Stealth Bomber. His new “offset strategy” ushered in the age of stealth, smart weapons, GPS, and technologies that changed the face of modern warfare. His vision now, as founder of the William J. Perry Project, is a world free from nuclear weapons.