Acting Assistant Secretary
Joel B. Bradburne
Joel Bradburne serves as the Acting Assistant Secretary for the Office of Environmental Management (EM). In this role he works to enable the safe and successful execution of the EM mission and provides leadership for the safe cleanup of the environmental legacy brought about from eight decades of nuclear weapons development and government-sponsored nuclear energy research.
Associate Principal Deputy Assistant Secretary for Field Operations, Office of Environmental Management
Gregory Sosson
Gregory Sosson is the Associate Principal Deputy Assistant Secretary for Field Operations for the Office of Environmental Management (EM). He is responsible for developing strategies, policy, and guidance for the 15 EM field sites in support of the EM mission. He oversees nuclear operations, safeguards and security, and technology development.
Associate Principal Deputy Assistant Secretary for the Office of Regulatory and Policy Affairs, Office of Environmental Management
Kristen Ellis
Kristen Ellis serves as the Associate Principal Deputy Assistant Secretary for the Office of Regulatory and Policy Affairs, and as the Director of Regulatory, Intergovernmental, and Stakeholder Engagement, within the US Department of Energy’s Environmental Management Office. Her portfolio includes infrastructure disposition, subsurface closure, regulatory compliance, waste and materials management and packaging and transportation.
Associate Principal Deputy Assistant Secretary for the Office of Corporate Services, Office of Environmental Management
Steve Trischman
Steve Trischman serves as the Associate Principal Deputy Assistant Secretary for the Office of Corporate Services, and as the Acting Deputy Assistant Secretary for Resource Management, within the US Department of Energy’s Environmental Management Office. His portfolio includes budget and planning, information systems, workforce management, acquisition and contract management and project management.
EM Field Managers
Leadership News
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Senior leadership from the U.S. Department of Energy Office of Environmental Management joined executives from Savannah River National Laboratory, Salado Isolation Mining Contractors and West Valley Cleanup Alliance at the 11th Annual National Cleanup Workshop to highlight key successes from the past several months and look ahead to future work. September 30, 2025September 30, 2025
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September 30, 2025 The more than 80 community leaders who took part in the recent Paducah Chamber of Commerce Fly-In discussed environmental cleanup progress, upcoming project milestones and long term planning for reindustrialization of the Paducah Site with members of Kentucky’s congressional delegation and U.S. Department of Energy leaders.September 30, 2025
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As the U.S. Department of Energy Office of Environmental Management addresses the legacy of the past, it has incredible opportunities to be part of what’s been dubbed Manhattan Project 2.0, a strong vision for the future focused on winning the global artificial intelligence race and ushering in a nuclear renaissance to fuel it, acting EM Assistant Secretary Joel Bradburne said in the keynote address at the 2025 National Cleanup Workshop.September 24, 2025
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U.S. Department of Energy officials and Paducah, Kentucky, community members take part in a meeting of the annual Paducah Chamber of Commerce Fly-In. September 23, 2025September 23, 2025
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Shawna Burtenshaw leads a team gearing up to finish the demolition of a submarine reactor prototype plant this year, a project that will reduce the legacy footprint of the Naval Reactors Facility and advance environmental cleanup at the Idaho National Laboratory Site. September 9, 2025September 9, 2025
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The National Cleanup Workshop is two weeks away, and there’s still time to register for it. September 9, 2025September 9, 2025