Acting Assistant Secretary/Principal Deputy Assistant Secretary
Roger A. Jarrell II
Roger Jarrell serves as the Principal Deputy Assistant Secretary and is currently also acting in the Assistant Secretary role for the Office of Environmental Management (EM). In this role he works to enable the safe and successful execution of the EM mission, while providing management oversight of activities, operations, and program integration across Department of Energy field sites.
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 Corporate Services, Office of Environmental Management
Dae Chung
Dae Chung serves as the Associate Principal Deputy Assistant Secretary for Corporate Services for the Office of Environmental Management (EM) at the U.S. Department of Energy. He is responsible for leading and overseeing the strategic corporate operations and essential business services necessary to support and enable the over $8 billion EM cleanup program including resource management, acquisition and project management.
Leadership News
-
More than 100 people attended the first U.S. House Nuclear Cleanup Caucus event of the year.April 1, 2025
-
During his recent visit to Oak Ridge, Energy Secretary Chris Wright observed cleanup projects.March 18, 2025
-
With the successful cleanup underway at the Oak Ridge Reservation serving as a “North Star,” the U.S. Department of Energy Office of Environmental Management is entering into a “unique moment”.March 18, 2025
-
The U.S. Department of Energy Office of Environmental Management has the potential to play an important role in the “nuclear renaissance” underway in the United States, senior EM leaders said.March 18, 2025
-
Interview with Portsmouth Paducah Project Office Manager, Joel Bradburne.March 4, 2025