On the final episode of the PONI Pathbreakers series, host Beverly Kirk talks with Ambassador Susan Burk, former Special Representative for Nuclear Nonproliferation, and Dr. Rebecca Davis Gibbons, assistant professor of political science at the University of Southern Maine and associate at the Project on Managing the Atom at Harvard’s Belfer Center. They discuss the future of the Treaty on Nonproliferation of Nuclear Weapons and their trailblazing careers in the nuclear community.