Heather Williams

Yes, I published a paper about nuclear disarmament in 2026. I know. Hear me out—understanding why disarmament is failing right now matters more than ever. New paper: "On Theories of Change: Rethinking the Ban Treaty and Disarmament Strategies" 🧵PDF: cgsr.llnl.gov/sites/cgsr/fil…

#NPT #RevCon. Living the dream. Gimme a shout if youre around but be prepared for my complaints about New York traffic, waste management, and lack of Dunkins.

On Monday, April 20, @heatherwilly, @tomkarako, and Kari Bingen will sit down with Senator Fischer for a conversation that will cover strategic forces in today's threat environment, recent conflicts, and modernization priorities. Register here: csis.org/events/strateg…

As the U.S. and Iran agree to a two-week ceasefire agreement the options for ending this war are timelier than ever. Project on Nuclear Issues (PONI) experts @heatherwilly and @NonproJoe explore the difficult choices facing the U.S. in addressing Iran’s nuclear program. Read the full analysis here: csis.org/analysis/optio…

Congratulations to SSP PhD student Daniel Cebul (@DCebul) on receiving the Smith Richardson Foundation’s World Politics and Statecraft Fellowship!

1/ The Department of Energy National Nuclear Security Administration just released its FY27 budget request. This is the funding roadmap for U.S. nuclear warhead modernization and the industrial base required to sustain the stockpile. Key takeaways thread:

PONI is now hiring for a Program Coordinator and Research Assistant! CSIS is seeking a full-time Program Coordinator and Research Assistant to join the Project on Nuclear Issues (PONI) to contribute to PONI’s mission of developing the next generation of nuclear experts and leading cutting-edge research on a range of nuclear issues. To learn more and apply: careers.csis.org/opportunities/…

In our upcoming Wednesday Seminar, Kari Bingen, Senior Fellow @CSIS, will discuss the landscape of space security and competition. 🗓️3/11 at noon ET 📍MIT community can join in person at E40-496 📡Bookmark the livestream youtube.com/live/B6ek7j3lC…

@FloEblenkamp I also evaluate the TPNW by the metrics its supporters emphasize: implementation, norm adherence, and membership. I acknowledge that it is still a young treaty and that progress on these fronts may take time.

@FloEblenkamp I’m not advocating a return to step-by-step. The paper argues for reinforcing what remains of the nuclear order (the NPT), holding bad actors accountable, and building bridges between NWS and NNWS—an approach shaped by a very different geopolitical and diplomatic context.

Congrats, @heatherwilly for engaging with the TPNW. We welcome this debate. You argue the #TPNW has failed and we should go back to the "step-by-step" approach of engaging patiently with the P5 under the NPT. Lets consider your arguments 🧵

Did you know that Hunt for Red October came out this week 36 years ago? No reason.

What is the most effective path to nuclear disarmament? In On Theories of Change: Rethinking the Ban Treaty and Disarmament Strategies, @heatherwilly the growing divide between the traditional step-by-step arms control model and the delegitimization approach embodied in the Treaty on the Prohibition of Nuclear Weapons. At a time of expiring treaties, renewed great power competition, and rising nuclear risks, the debate over the TPNW reflects deeper disagreements about strategy, sequencing, and the role of norms in shaping state behavior. Read her full analysis here: cgsr.llnl.gov/sites/cgsr/fil…

The paper proposes three alternative theories of change — outside the usual silos. With New START gone, NPT RevCon approaching, and nuclear risks rising, we need new thinking.

The disarmament project can't be abandoned as nuclear risks rise. It's the foundation of the NPT grand bargain and matters to US allies and partners—and walking away from it erodes the transparency, stability, and crisis communication tools we need right now.

Yes, I published a paper about nuclear disarmament in 2026. I know. Hear me out—understanding why disarmament is failing right now matters more than ever. New paper: "On Theories of Change: Rethinking the Ban Treaty and Disarmament Strategies" 🧵PDF: cgsr.llnl.gov/sites/cgsr/fil…

Great insights as always from Nicole. In the context of the upcoming NPT RevCon, this is particularly important.

Great piece from the team at @csisponi and kudos for highlighting the risks with Bushehr

Great analysis by my colleagues @NonproJoe and @baileyschiff about targeting the remanants of Iran’s nuclear program in Operation Epic Fury @csisponi csis.org/analysis/opera…