Under Secretary for Nuclear Security

Under Secretary for Nuclear Security is a high-level official within the United States Department of Energy who also serves as the Administrator of the National Nuclear Security Administration (NNSA). The position was established by the National Defense Authorization Act for Fiscal Year 2000, which created the NNSA as a semi-autonomous agency within the Department of Energy. The Under Secretary is responsible for the management and security of the nation's nuclear weapons stockpile, naval nuclear reactors, and efforts to prevent nuclear proliferation.

History

The position was created in response to significant security and management failures at the nation's nuclear weapons laboratories, most notably the Wen Ho Lee espionage case at Los Alamos National Laboratory. The United States Congress, through legislation spearheaded by Senator Pete Domenici, mandated the formation of the National Nuclear Security Administration to consolidate oversight of the nuclear weapons complex. The first Under Secretary, Linton Brooks, was confirmed by the United States Senate in 2000. The role was designed to provide clear, high-level accountability for the United States nuclear weapons program, separating it from the broader energy and science missions of the Department of Energy.

Responsibilities

The Under Secretary for Nuclear Security has authority over all elements of the National Nuclear Security Administration. Key responsibilities include directing the Stockpile Stewardship Program to ensure the safety and reliability of the United States nuclear arsenal without underground testing. The office oversees the design and production of nuclear warheads at facilities like the Kansas City National Security Campus and the Pantex Plant. It manages the Nuclear Propulsion Program for the United States Navy, including work at the Bettis Atomic Power Laboratory and the Knolls Atomic Power Laboratory. The Under Secretary also leads global nuclear non-proliferation efforts, such as the Megaports Initiative and the Global Threat Reduction Initiative, and is responsible for the physical security and cybersecurity of NNSA sites, including the Y-12 National Security Complex and the Nevada National Security Site.

Appointment and succession

The Under Secretary for Nuclear Security is appointed by the President of the United States and must be confirmed by the United States Senate. The individual serves at the pleasure of the president and reports directly to the United States Secretary of Energy. By statute, the Under Secretary is a Level II position in the Executive Schedule. In the event of a vacancy, the Deputy Administrator for Defense Programs or another senior official within the National Nuclear Security Administration may perform the duties of the office until a new appointment is confirmed. The position is considered a critical national security role, often filled by individuals with extensive backgrounds in nuclear weapons, national security policy, or the United States Department of Defense.

List of Under Secretaries

The following individuals have served as Under Secretary for Nuclear Security and Administrator of the National Nuclear Security Administration: * Linton Brooks (2002–2007) * Thomas D'Agostino (2007–2014) * Frank G. Klotz (2014–2018) * Lisa E. Gordon-Hagerty (2018–2021) * Jill Hruby (2021–present) Several officials have served in an acting capacity, including William H. Tobey and Neile L. Miller.

Related positions

Several other high-level positions are closely associated with the work of the Under Secretary. The Deputy Administrator for Defense Programs oversees the nuclear weapons stockpile. The Deputy Administrator for Naval Reactors, a position historically held by Admiral Hyman G. Rickover, leads the naval nuclear propulsion program. Within the Department of Energy, the Under Secretary for Science and Innovation manages civilian nuclear energy research. In the broader United States national security apparatus, related roles include the Assistant Secretary of Defense for Nuclear, Chemical, and Biological Defense Programs, the Director of the Central Intelligence Agency, and the United States Strategic Command commander. Category:United States Department of Energy officials Category:National Nuclear Security Administration