Brandon Williams
@NNSAWilliams
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Serving as the Under Secretary of Nuclear Security @ENERGY and NNSA Administrator under the leadership of President Trump. Sworn in on September 26, 2025.
Washington, DC
Joined April 2014
Today, we celebrate the 51st anniversary of the formation of NNSA's NEST—the Nuclear Emergency Support Team. Learn about NEST’S role as the 911 of radiological incident response: https://t.co/suFyJWb5SV
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Today, we honor the men and women in uniform of our great nation. May their love of country, sacrifices, and patriotism never be forgotten. To my brothers and sisters in arms: thank you for carrying the torch in defense of our freedoms. 🇺🇸
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What. A. Morning. The Opening Plenary at #ANSwinter2025 was jam-packed with wide-ranging insights across government, industry, and academia. The new nuclear century is upon us, and today's speakers made it look brighter than ever. Thank you @SecretaryWright (@ENERGY),
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Pleasure keynoting @ANS_org’s Winter Conference and leading a discussion on American leadership in new nuclear with @NNSAWilliams & TVA CEO Don Moul. We must seize the moment to deploy Micro, Small, and Large Reactors nationwide and build on the Trump Administration’s work to
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We're kicking off the 2025 ANS Winter Conference & Expo with perspectives from government leaders in nuclear power and national defense. These opening plenary speakers will discuss opportunities and challenges shaping the nuclear landscape, including building a stronger
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Supercomputing for a safer tomorrow 🧠✨We’re partnering with @HPE and @NVIDIA to build two new AI-driven supercomputers, Mission and Vision, to advance national security and open science. This next-generation tech will ensure U.S. leadership in AI 👉 https://t.co/7GBvgUQa6P
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NNSA has a proud history of applying science and technology to national security challenges. The next generation of NNSA supercomputers marks a significant milestone in ensuring America's leadership in the global AI race. 🚀
NNSA is proud to announce a new partnership with @HPE and @nvidia at @LosAlamosNatLab. Meet: 'Mission' and 'Vision,' two new supercomputers that are set to significantly advance U.S. national security, AI, and scientific research capabilities. A major step in winning the AI race.
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Yesterday, I had a great discussion at the U.S. Fusion Forum, highlighting NNSA's historic fusion milestones. I’m excited to work with our labs to drive the next generation of fusion innovation.
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It is an honor to serve the American people and lead the National Nuclear Security Administration. I thank @POTUS for his trust in me to serve in this critical role. I look forward to working with @SecretaryWright to maintain America's leadership in science and national security.
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This was an excellent conversation. Thank you for having me!
.@RLHeinrichs sits down with Jill Hruby, the under secretary for nuclear security of @ENERGY and administrator of the @NNSANews, to discuss the state of America's nuclear enterprise. Watch live: https://t.co/yfhxPQUpDF
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Thursday, Jan. 16 at 10am ET: Tune in as @NNSAHruby speaks at @HudsonInstitute about the significant progress NNSA has made in a challenging global environment and our strong momentum heading forward. Learn more and register: https://t.co/qvUVsdGDnw
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Thanks to the entire NNSA team who contributed to the program over the last 12 years! Lean more about this B61-12 milestone here:
energy.gov
NNSA completed the Last Production Unit (LPU) of the B61-12 Life Extension Program (LEP). The B61-12 is the latest modification to the B61 family of gravity bombs, which are deployed from U.S. Air...
#NNSA has completed the B61-12 Life Extension Program, marking the conclusion of one of the most significant weapon modernization programs since the end of the Cold War. The B61-12 is critical for the U.S. air-delivered nuclear deterrent: https://t.co/PtOzpWgGhc
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This was fun, thank you for having me on @nuclecast!
"#Innovate, #collaborate, #deliver." Administrator Hruby talks about keeping the momentum and increased activity across #NNSA. Listen here https://t.co/MSsnpumH9a
@NNSAHruby
@NNSANews #nuclearsecurity #pitproduction #NIF #Deterrence @moderntriad
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Nuclear energy is poised for growth, and #NNSA is working to support U.S. advanced/small modular reactor developers on best practices for deploying responsibly. Learn how we and our partners are actively evaluating HALEU risks: https://t.co/mcFZzsUK4W
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Great hosting a first-of-its-kind event with leadership from our Management & Operating partners who we count on to keep the Nuclear Security Enterprise delivering and improving. Together, we discussed our system of contracts, the Enterprise Blueprint, and the future of the NSE.
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It was a pleasure meeting with Ambassador Cho to discuss the ongoing importance of U.S.-ROK cooperation on nuclear security. 🇺🇸🇰🇷
Amb. Cho met with Jill Hruby, Under Secretary of the Department of Energy (DOE) and Administrator of the National Nuclear Security Administration (NNSA). Both sides discussed ROK-U.S. nuclear cooperation and emphasized the need to further strengthen it.
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