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.
Acting Associate Principal Deputy Assistant Secretary for the Office of Corporate Services, Office of Environmental Management
Steve Trischman
Steve Trischman serves as the Acting Associate Principal Deputy Assistant Secretary for the Office of Corporate Services, and as the 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.
Leadership News
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Office of Environmental Management Principal Deputy Assistant Secretary Roger Jarrell recently joined community stakeholders and employees at the West Valley Demonstration Project to celebrate a major milestone. June 24, 2025.June 24, 2025
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Just six months into 2025, the U.S. Department of Energy Office of Environmental Management has racked up significant cleanup accomplishments across the country, with more progress on the horizon, senior EM federal and contractor executives said here last week. June 17, 2025.June 17, 2025
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More than 100 people attended the first U.S. House Nuclear Cleanup Caucus event of the year.April 1, 2025
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During his recent visit to Oak Ridge, Energy Secretary Chris Wright observed cleanup projects.March 18, 2025
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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
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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