Jackie Siebens is director of public affairs at Helion Energy, a fusion power company, and a senior fellow with the Atlantic Council’s Global Energy Center. Previously, she was director of government affairs at Oklo, a clean energy company, and senior policy advisor for nuclear energy with Third Way’s climate and energy program. Prior to those roles, she was an associate with the nuclear security program at the Stimson Center, where she worked with the private sector performing analysis to develop nuclear security standards. Siebens has been a board member of the Foundation for Nuclear Studies and International Nuclear Security Forum. She has published and presented with multiple nuclear-focused organizations and regularly briefs Congress on the development of advanced nuclear reactors and application of nuclear security and safeguards.