Jackie (Kempfer) Siebens is currently the director of public affairs at Helion and was previously the director of government affairs at Oklo. She also previously served as senior policy advisor with Third Way’s Climate and Energy Program, where she designed and advocated for policies that will drive innovation and deployment of clean energy technologies, with a focus on advanced nuclear reactors. While at Third Way, she launched the Resource Council for Advanced Reactor Developers which serves as a forum for collaboration among the nonproliferation, nuclear security, and advanced nuclear developer communities. She also advocates for the continued safe operation of the US’ existing fleet of nuclear power plants.  

Previously, Jackie was also an associate with the Nuclear Security Program at the Stimson Center, where she worked with the private sector performing analysis to develop comprehensive nuclear security standards, and incentivize industry stakeholders to reduce the risks posed by nuclear terrorism.

Jackie is a graduate of East Carolina University and earned her master’s degree from the North Carolina State University School of Public and International Affairs. Throughout her career, she has published and presented with numerous organizations including the International Nuclear Law Association, the International Atomic Energy Agency, the Institute for Nuclear Materials Management, and the World Institute for Nuclear Security. She regularly briefs the US Congress on matters related to the development of advanced nuclear reactors, and the application of nuclear security and safeguards.