Under Secretary of Energy for Nuclear Security

The Under Secretary for Nuclear Security, in the United States Department of Energy, is the Administrator for the National Nuclear Security Administration. 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.

Under Secretary of Energy for Nuclear Security
S5
Seal of the U. S. Department of Energy
Incumbent Teresa Robbins[1] Acting  since January 20, 2025
United States Department of Energy
Style	Mr./Ms. Under Secretary
Member of	U. S. Department of Energy
Reports to	U. S. Deputy Secretary of Energy
Seat	Washington, D.C., United States
Appointer	The President with Senate advice and consent
Term length	Appointed
Formation	2000
First holder	John A. Gordon
Website	www.energy.gov

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.

Officeholders

Under Secretary of Energy for Nuclear Security
Administrator of the National Nuclear Security Administration

No.	Portrait	Name	Tenure	Notes	President(s) served under
1		John A. Gordon	June 28, 2000–June 27, 2002	[4][5][6]	Bill Clinton
					George W. Bush
2		Linton Brooks	May 16, 2003–January 2006	[7][8]
3		Tom D'Agostino	August 30, 2007–January 18, 2013	[9][10]
					Barack Obama
–		Neile L. Miller	January 19, 2013–March 15, 2014
–		Bruce Held	March 16, 2014–April 16, 2014	[11]
4		Frank Klotz	April 17, 2014–January 20, 2018	[12][13][14]
					Donald Trump
5		Lisa Gordon-Hagerty	February 22, 2018–November 6, 2020	[15][16][17]
–		William Bookless (acting)	November 6, 2020–January 20, 2021	[16][18][19]
–		Charles P. Verdon (acting)	January 20, 2021–July 26, 2021	[20]	Joe Biden
6		Jill Hruby	July 26, 2021–January 20, 2025	[21][22]
–		Teresa Robbins	January 20, 2025–present	[23]	Donald Trump