Isabelle Williams

Senior Advisor, Global Nuclear Policy Program

Isabelle Williams joined NTI in 2007 and serves as Senior Adviser to the Global Nuclear Policy Program. As part of this work she helps coordinate the international strategy of the program, managing the work of NTI’s global partners who conduct various activities in their countries and regions to promote reducing reliance on nuclear weapons and reducing global nuclear risks. Her areas of focus also include NATO nuclear policy, UK nuclear policy, nuclear disarmament, and U.S.-Russia relations.

Williams came to NTI from the Partnership for Global Security, where she managed their next generation nonproliferation program and was previously a research associate at the Chemical and Biological Arms Control Institute where she focused on research relating to chemical weapons, biosecurity and bioterrorism preparedness and response. She also held successive positions at the International Institute for Strategic Studies in London. Williams holds a bachelor's degree and master's degree (Hons) in International Studies both from the University of Leeds, UK.


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Former Senator Sam Nunn, former Secretary of State George P. Shultz, former Secretary of State Henry A. Kissinger and former Secretary of Defense William J. Perry.

Nuclear Security Project

The Nuclear Security Project is an effort led by former Secretary of State George P. Shultz, former Defense Secretary William J. Perry, former Secretary of State Henry A. Kissinger, and former Senator Sam Nunn to galvanize global support for and action on the vision of a world without nuclear weapons and the steps to get there.
Nunn and Singapore Foreign Minister

Regional Leadership Networks to Reduce Nuclear Risk

Hundreds of leaders and highly respected experts from across five continents are members of NTI-sponsored regional networks dedicated to generating global momentum for reducing reliance on nuclear weapons and the risks they pose.
Lancaster House-NSP

Building Mutual Security in the Euro-Atlantic Region

A Track II dialogue among distinguished former senior political leaders, senior military officers, defense officials, and security experts from Europe, Russia, and the United States