Under Secretary of Energy for Nuclear Security

The under secretary for nuclear security is the administrator for the National Nuclear Security Administration within the United States Department of Energy. The National Nuclear Security Administration's responsibilities include designing, producing, and maintaining safe, secure and reliable nuclear weapons for the U.S. military, providing safe, militarily effective naval nuclear propulsion plants, and promoting international nuclear safety and nonproliferation.

StyleMr. Under Secretary

MemberofUnited States Department of Energy

ReportstoUnited States Deputy Secretary of Energy

SeatWashington, D.C., United States

Quick facts United States Under Secretary of Energy for Nuclear Security, Style ...

United States Under Secretary of Energy for Nuclear Security
Seal of the U.S. Department of Energy
Incumbent Brandon Williams[1] since September 26, 2025
United States Department of Energy
Style	Mr. Under Secretary
Member of	United States Department of Energy
Reports to	United States Deputy Secretary of Energy
Seat	Washington, D.C., United States
Appointer	President of the United States with Senate advice and consent
Term length	Appointed
Formation	2000
First holder	John A. Gordon
Website	www.energy.gov

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The under secretary for nuclear security is appointed by the president and confirmed by the Senate. The under secretary is required to have extensive background in national security, organizational management, and appropriate technical fields.^[2] The under secretary is also a member of the Nuclear Weapons Council, and is the chair of the Council when a majority votes that the issue at hand is the primary concern of the Department of Energy.^[3] The under secretary is paid at level III of the Executive Schedule.