About Us


The Assistant Secretary of Defense for Energy, Installations, and Environment ASD (EI&E) provides budgetary, policy, and management oversight of the Department of Defense's (DoD): acquisition and use of operational and installation energy to support warfighting and base operations, which encompasses energy security, increased energy efficiency, and promotion of renewable energy sources; $880 billion real property portfolio which encompasses more than 500 installations, 562,000 buildings and structures, and 25 million acres; installations support management to invest in DoD facilities, Base Realignment and Closure efforts; and the Environment, Safety, and Occupational Health (ESOH) activities, which include legal compliance, natural and cultural resource management, and environmental cleanup of hazardous waste and munitions. The ASD(EI&E) is the Department’s Chief Sustainability Officer, the Senior Real Property Officer and the Designated Agency Safety and Health Official. In addition, the ASD(EI&E) oversees the Department's the Office of Economic Adjustment and the DoD Siting Clearinghouse.

Fact Sheets

Contact Us

Lucian Niemeyer
Assistant Secretary of Defense for
Energy, Installations, and Environment
Addison "Tad" Davis
Principal Deputy Assistant Secretary of Defense for
Energy, Installations, and Environment


Office of the Assistant Secretary of Defense (Energy, Installations, and Environment)
3400 Defense Pentagon, Room 5C646 Washington, DC 20301-3400
(703) 571-9076


For technical assistance, contact the webmaster at OSD.ATL-Webmaster@mail.mil
For technical assistance contact the AT&L Webmaster at OSD.ATL-Webmaster@mail.mil
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