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.
| United States Under Secretary of Energy for Nuclear Security | |
|---|---|
Seal of the U.S. Department of Energy | |
Incumbent since September 26, 2025Brandon Williams | |
| 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 |
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. 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. The under secretary is paid at level III of the Executive Schedule.
Officeholders
| No. | Portrait | Name | Term start | Term end | Refs. | President(s) served under |
|---|---|---|---|---|---|---|
| 1 | John A. Gordon | June 28, 2000 | June 27, 2002 | Bill Clinton | ||
| George W. Bush | ||||||
| 2 | Linton Brooks | May 16, 2003 | January 2006 | |||
| 3 | Tom D'Agostino | August 30, 2007 | January 18, 2013 | |||
| Barack Obama | ||||||
| acting | Neile L. Miller | January 19, 2013 | March 15, 2014 | |||
| acting | Bruce Held | March 16, 2014 | April 16, 2014 | |||
| 4 | Frank Klotz | April 17, 2014 | January 20, 2018 | |||
| Donald Trump | ||||||
| 5 | Lisa Gordon-Hagerty | February 22, 2018 | November 6, 2020 | |||
| acting | William Bookless | November 6, 2020 | January 20, 2021 | |||
| acting | Charles P. Verdon | January 20, 2021 | July 26, 2021 | Joe Biden | ||
| 6 | Jill Hruby | July 26, 2021 | January 20, 2025 | |||
| acting | Teresa Robbins | January 20, 2025 | September 26, 2025 | Donald Trump | ||
| 7 | Brandon Williams | September 26, 2025 | Present |
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