Serving as the Under Secretary of Nuclear Security @ENERGY and @NNSAnews Administrator under the leadership of President Trump. Sworn in on September 26, 2025.

Washington, DC
Credible deterrence demands that we move with urgency, and the progress we’re making on W93/Mk7 demonstrates exactly that. We are revitalizing and modernizing the Nuclear Security Enterprise to design, develop, and produce this critical new weapon with the precision our Warfighters demand. We will continue working together to deliver this capability to the fleet and ensure our sea-based strategic deterrent remains ready for the future. navy.mil/Press-Office/News-S…
3
9
47
4,255
It takes nuclear expertise to detect nuclear activities—and experiments like these ensure America remains unmatched in detection.  The Trump Administration has made it clear that the United States will lead from a position of strength. American innovation will not be outmatched. energy.gov/nnsa/articles/nns…
1
7
37
2,242
As a former submarine officer who did six strategic deterrent patrols aboard USS Georgia (SSBN 729), being underway on the USS Idaho (SSN 799) with @USNavyNNPP Adm. Houston brought back great memories. It’s incredible to see our next-generation deterrence capabilities in action. Bravo Zulu to the crew keeping the watch.
2
6
539
Brandon Williams retweeted
“The United States helps the @iaeaorg execute its mission so that together we can continue to be a force for good in the world for another 70 years and beyond.” – Brandon Williams, Energy Under Secretary for Nuclear Security @NNSANews
1
2
5
626
Brandon Williams retweeted
That’s a wrap on the 70th @iaeaorg General Conference in Vienna! @NNSAWilliams was proud to join @SecretaryWright and @usunvie to reaffirm American leadership in nuclear security and nonproliferation. Together with the IAEA and our international partners, NNSA remains dedicated to advancing safe, secure, and peaceful nuclear technology across the globe.
2
7
22
2,658
Brandon Williams retweeted
October 8 Washington Power the frontier. 🇺🇸
13
65
293
23,681
Deterrence is never static. We have to keep moving forward. More on the importance of public-private partnerships in the fusion industry and ensuring the US stays ahead of our adversaries. wsj.com/politics/national-se…
1
7
32
2,114
Brandon Williams retweeted
Earlier this month, @NNSAWilliams visited @LosAlamosNatLab alongside Deputy Assistant to the President Dr. @SebGorka, who is advancing President Trump's national security agenda. NNSA is proud to partner with him. The Trump Administration is focused on American strength and deterrence: holding crucial discussions on cutting-edge Counter-Unmanned Aircraft Systems (C-UAS) to safeguard our critical infrastructure and outpace evolving drone threats.
1
7
26
21,499
For decades, our Nuclear Security Enterprise has balanced two imperatives: fielding a credible deterrent while upholding rigorous safety and security standards. Can AI help? In my latest article, I share how @NNSANews is combining AI supercomputing and additive manufacturing through the Genesis Mission to build Aires Tide - a flight test vehicle that took months rather than years, and at a fraction of historical costs. I invite you to read the full article. warontherocks.com/cogs-of-wa…
1
7
25
1,707
Brandon Williams retweeted
Kicking off the @iaeaorg #GC70 this week! Led by Secretary Wright and Ambassador Griffith, our delegation is proud to represent America at the IAEA General Conference this week!  We’re here to champion U.S. nuclear energy leadership, strengthen nuclear security and cooperation, and promote American interests. @ENERGY @NRCgov @NNSAnews @State_IO @StateACN
1
1
15
2,827
The era of primarily emphasizing Stockpile Stewardship is over. Going forward we will be defined primarily as an organization focused on weapons production.
24
73
821
77,911
On this somber day, we remember the innocent lives lost 25 years ago in senseless acts of terrorism. It was a day when our nation stood together in the face of evil—united by courage, resilience, and an unwavering love of country. May we never forget the first responders who rushed toward danger, the families whose lives were forever changed, and the heroes who have continued to serve and protect our nation. God bless America. May we never forget. 🇺🇸
2
16
2,543
Brandon Williams retweeted
In another major Trump Administration national security win, Vermont joins the growing list of states cleared of high-risk cesium-137. NNSA continues to lead national efforts to remove radiological devices to eliminate their risk and keep Americans safe. More here: energy.gov/nnsa/articles/und…
4
22
1,477
The Nuclear Security Enterprise is delivering critical capabilities at speed and strengthening the industrial capacity needed to stay ahead of evolving global threats. By executing our modernization programs ahead of schedule, we are strengthening America’s deterrent and supporting President Trump’s commitment to peace through strength.
Y-12 just wrapped up production on its B61-13 deliverables a staggering SEVEN MONTHS early. NNSA Principal Deputy Administrator Scott Pappano sealed the historic win by personally diamond-stamping the final Canned Subassemblies (CSAs). This is what unmatched speed and urgency looks like when it comes to national defense. More here: energy.gov/nnsa/articles/nns…
9
1,264
The defense industrial base is not separate from our national defense—it is the foundation upon which deterrence rests.
2
13
557
Demonstrating production competence is essential to deterrence—it signals to our adversaries that this new strategic competition is one we do not intend to lose.
5
455
NNSA is the only organization in the nation capable of fulfilling our no-fail national security mission. Our workforce is the backbone of our national security. Serving the nation through the Nuclear Security Enterprise demands patriotism, dedication, and excellence. Together, we are returning to our roots in the Manhattan Project and the central tenants of Deterrence, Urgency, and Production to meet this critical moment in history.
1
2
17
904
Brandon Williams retweeted
This Labor Day, NNSA honors the world-class scientists, engineers, skilled workers, and specialists across our Nuclear Security Enterprise. Day in and day out, their hard work delivers a modern, resilient nuclear deterrent to protect our nation and our allies. Driven by a mission of deterrence, urgency, and production, our people are the backbone of national defense. Drop a 👏 in the comments to thank the men and women of the NNSA keeping America safe!
1
7
32
2,629