Stimson Centre

The Stimson Center is a nonpartisan Washington DC policy research organisation founded in 1989, named after Henry L. Stimson, the US Secretary of War who oversaw the Manhattan Project and the Hiroshima decision. It focuses on international security, nuclear nonproliferation, arms control, and conflict prevention. Its analysts contribute to Congressional testimony, diplomatic track-two dialogues, and major media outlets on questions of nuclear risk, proliferation, and great-power competition. The centre is distinct from hawkish advocacy shops: it houses both deterrence realists and disarmament advocates, giving it unusual credibility when critiquing escalation on Iran and the erosion of arms-control architecture.

Stimson's nuclear security programme has tracked Iran's enrichment programme across the JCPOA era and its aftermath, publishing assessments of verification mechanisms, breakout timelines, and the strategic consequences of the 2018 US withdrawal. Its analysts assessed that military action could slow but not eliminate Iran's nuclear knowledge or materials, a position that gained renewed traction in 2026 after IAEA Director General Rafael Grossi made the same argument publicly during the conflict. The centre also houses work on the Strait of Hormuz as a proliferation-adjacent chokepoint and on the collapse of multilateral diplomatic formats, including the effective paralysis of the P5+1 framework.

In the 2026 Iran conflict, Stimson analysts were cited in Lowdown coverage as independent assessors of Ceasefire proposals and asset-release sequencing debates. The centre's cross-partisan founding ethos — it draws from both Republican and Democratic foreign-policy traditions — gives its analysis weight in a Washington environment where most Iran-focused research organisations are openly aligned with a maximalist or minimalist camp.