William Bookless, a former associate director at Lawrence Livermore National Laboratory, will be nominated as principal deputy administrator for the National Nuclear Security Administration, the White House announced.

Senate confirmation is required. If confirmed, Bookless will be the third manager with LLNL connections to move recently to NNSA, which is the semi-autonomous branch of the U.S. Department of Energy responsible for nuclear weapons.

Former LLNL health physicist Lisa Gordon-Hagerty was nominated late last year to be NNSA administrator, the agency’s senior management position. She has been confirmed by the Senate.

Charles Verdon, principal associate director at LLNL, was subsequently nominated by the White House to be Gordon-Hagerty’s deputy for defense programs. He has not yet been confirmed.

Bookless, a physicist, worked in LLNL defense programs for 32 years, both as a research scientist and as a manager. He was named associate director for safety and environmental protection in 2004.

He moved to Washington, DC, in 2009, where he played key roles in NNSA contributions to the 2010 Nuclear Posture Review and the New START nuclear arms treaty with Russia.

In 2012, he moved to Brookhaven National Laboratory, where he served as assistant laboratory director for three years.