Head of US Agency Overseeing Nuclear Weapons Stockpile Resigns

Under Secretary for Nuclear Security of the U.S. Department of Energy and Administrator of the National Nuclear Security Administration Lisa Gordon-Hagerty tours the Ohio-class ballistic missile submarine USS Alabama in Bangor, Washington, on Oct. 10, 2018. Amanda R. Gray/U.S. Navy/Handout via Reuters

WASHINGTON—The head of the agency that oversees the U.S. stockpile of nuclear weapons has resigned, the U.S. Energy Department’s National Nuclear Security Administration said on Friday, without providing a reason.

Lisa Gordon-Hagerty resigned as administrator of the NNSA, a semi-autonomous branch of the department.