The Bureau of Arms Control and Nonproliferation prevents the spread of nuclear, biological, chemical, and radiological WMD. Terms of Use: https://xitter.cf/t.co/pWturgLxxN.
Washington, DC
Joined April 2013
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I'm honored to serve as Assistant Secretary for Arms Control and Nonproliferation, and grateful to @POTUS and @SecRubio for their confidence. Alongside the talented professionals of the ACN bureau, we will execute @POTUS 's mission of making America safer, stronger, and more prosperous. Stay tuned for updates on our efforts!
Rapid advances in emerging biotechnologies bring new and evolving risks, including the potential misuse of scientific knowledge and unauthorized access to sensitive biological data.
To respond to these emerging challenges, the Inter-American Committee against Terrorism #CICTE of @OAS, organized the training “Safeguarding Advanced and Emerging Biotechnologies,” held in Buenos Aires, Argentina, from September 28-30.
Over the three-day training, researchers, life sciences professionals, and information technology specialists from Argentina’s public and private sectors heard from U.S. biotech experts and strengthened their knowledge of:
🔹 Research security
🔹 Mitigating risks of Dual-use research of concern (DURC)
🔹 Cyberbiosecurity
🔹 Institutional risk management, due diligence, and governance frameworks
Participants are expected to implement research security best practices driven by the United States, assess risks associated with the misuse of biological technologies, and contribute technical inputs to national governance mechanisms.
It is our commitment to continue working with our member states to promote the responsible management of advanced biotechnologies as part of broader efforts to advance regional security, in line with U.S. standards.
This activity is part of the Safeguarding Advanced and Emerging Biotechnologies project, implemented by the OAS/CICTE. #Biosecurity #Biotechnology #ResearchSecurity #Cyberbiosecurity #CICTE #OAS #Argentina
My sincere thanks to @pepperdine, @Reagan_Library, and @ReaganInstitute for inviting me to speak at their Reykjavik Summit 40th Anniversary! It was an honor and privilege to speak on this historic 1986 summit and on the profound opportunity for trilateral arms control today. 🇺🇸
At the #UNGA #FirstCommittee, Assistant Secretary Christopher Yeaw delivered the U.S. statement. The U.S. is championing a new era of arms control centered on direct engagement with China & Russia while preventing nuclear proliferation. @UnderSecT @StateACN
@USUN #Disarmament
State ACN Bureau retweeted
On the sidelines of #UNGA81, the @UnderSecT team co-hosted an event with @NIHDirector_Jay to highlight U.S. international leadership in implementing new standards to halt dangerous gain of function research. Representatives from 25 countries attended to learn more about how they can join us to #StopDGOF. Grateful also to Anna Puglisi (@WHOSTP47) and Taylor Sexton(@USForeignAssist) for their important contributions to the engagement.
state.gov/releases/office-of…
Great conversation between ACN's Deputy Assistant Secretary Gonzalo Suarez and @DornsifeDC students on protecting critical technologies, countering Iran's nuclear threat, and expanding U.S. civil nuclear partnerships that build lasting ties worldwide. Kudos to the next generation of national security leaders at @DornsifeDC!
State ACN Bureau retweeted
🇺🇸🇵🇪 EE. UU. celebra la incorporación de Perú como socio bilateral del programa FIRST, fortaleciendo nuestra cooperación en energía nuclear civil. Este nuevo paso permitirá ampliar los intercambios técnicos, la capacitación y la colaboración para el desarrollo responsable de tecnologías nucleares avanzadas.
State ACN Bureau retweeted
Over 50 countries joined a 🇺🇸-hosted consultation on a UN First Committee U.S. resolution on non-proliferation, arms limitation, and disarmament obligations. DPR Taylor urged support, stressing compliance is essential for regional and global peace, security, and stability.
State ACN Bureau retweeted
The @StateDept , supported by Pacific Northwest National Laboratory partnered with @Marocdiplo_EN and @FAR_Maroc_ to bring practitioners from 10 African States Parties to the Chemical Weapons Convention (CWC) to participate in “Atlas,” a three-day tabletop exercise focused on preventing, detecting, and responding to chemical terrorism threats. Through interactive discussions and exercises, and under guidance from a diverse set of experts, notably from the Organization for the Prohibition of Chemical Weapons @OPCW, participants explored ways to strengthen cooperation and preparedness to address evolving chemical security challenges in a modern-day setting.
Fantastic meeting with AMB Gediminas Varvuolis from Lithuania! The United States' defense pact with our NATO allies remains iron clad. We look forward to vigorously working with Lithuania in accordance with President Trump’s EO 14299 to explore a bright, nuclear-powered future!
Thrilled to represent the State Dept in the @IAEA ATLAS Ministerial launch event here in Washington, DC. Nuclear power in the civil maritime industry has tremendous potential. The 🇺🇸 is committed to leading the development and deployment of civil nuclear-powered ships and floating nuclear power plants under the highest standards for safety, security, and nonproliferation.
During the U.S. hosted @IAEA ATLAS Ministerial launch event, we traveled to visit the NS Savannah in Baltimore, MD. The United States produced the world’s first-ever nuclear-powered civilian ship, and 🇺🇸 will continue to lead as we look towards the next generation of this technology.
State ACN Bureau retweeted
Thanks to Amelie Klussman, Security Policy Director at Germany’s MFA, for today’s discussion. Built on the foundation of NATO extended nuclear deterrence, Germany’s reindustrialization and increased defense spending are key to advancing NATO 3.0.
During the U.S. hosted @IAEA ATLAS Ministerial launch event, we traveled to visit the NS Savannah in Baltimore, MD. The United States produced the world’s first-ever nuclear-powered civilian ship, and 🇺🇸 will continue to lead as we look towards the next generation of this technology.
My sincerest thanks to ADM Correll for inviting me to serve as a keynote speaker at the 2026 STRATCOM Deterrence Symposium! It was an honor to address such an array of USG leadership, deterrence experts, and the personnel who generate deterrence for America on a daily basis.
State ACN Bureau retweeted
Signing a Strategic Civil Nuclear Cooperation MOU with Paraguay is just another step in the continued growth of our relationship between our two countries. We’ve always had strong links between the United States and Paraguay, and now, those links are even stronger.
ALT Secretary Marco Rubio stands next to Paraguayan Foreign Minister Rubén Ramírez Lezcano. Both officials hold a folder of their respective signed Strategic Civil Nuclear Cooperation memorandum of understanding in Washington, DC on August 4, 2026. They stand behind a polished wood table with table tents directly in front of each officials that reads Paraguay and United States of America. Behind the officials are displays of U.S. and Paraguayan flags, two wood chairs, and a hanging framed portrait of former Secretary of State Colin Powell. (State Department/Freddie Everett)
State ACN Bureau retweeted
Thank you to Deputy Secretary General Mareena Binti Mahpudz from the Ministry of Energy Transition and Water Transformation @PETRAMalaysia for hosting us today. We discussed civilian nuclear cooperation and Malaysia’s strategy to ramp up energy production to match its growing economy. 🇺🇸🇲🇾
State ACN Bureau retweeted
As a co-founder of the Nuclear Forensics International Technical Working Group, @NNSANews attended the 29th Plenary meeting in Berlin alongside @FBI and @StateACN.
International collaborations contribute to American capability to prevent nuclear threats and hold perpetrators accountable.
