Director of Green Cross International’s Environmental Security and Sustainability programme, Paul has helped lead the programme since its inception in the mid-1990s with colleagues from Russia and Switzerland.  He is also manager of the Washington DC office for GCI and its US national affiliate, Global Green USA.  Paul Walker hails from the United States.

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Paul is a former Professional Staff Member of the Armed Services Committee in the U.S. House of Representatives where he served as a senior advisor to the Chairman and full committee.  Walker holds a Ph.D. in security studies from the Massachusetts Institute of Technology; an M.A. from Johns Hopkins School for Advanced International Studies; a Russian Honors Certificate from the Defense Language Institute of the West Coast; and a Post-Doctoral Fellowship from the Center for Science and International Affairs at Harvard University.  He is also a Vietnam-era U.S. Army veteran.

Paul has worked, spoken, and published widely in the areas of international security, threat reduction, non-proliferation, and weapons demilitarization for over three decades and took part in the first on-site inspection by US officials of the Russian chemical weapons stockpile at Shchuch’ye in the Kurgan Oblast in 1994.   Since that time he has worked closely with the Organization for the Prohibition of Chemical Weapons (OPCW), US and Russian officials, the Cooperative Threat Reduction (CTR) Program, the G-8 Global Partnership, and other multilateral regimes to help foster cooperative, timely, and safe elimination of nuclear, chemical, and biological weapons and related systems.

In December 2009 at the 14th Conference of the States Parties in The Hague, Paul led the effort to establish the CWC Coalition, an international NGO network to support the Chemical Weapons Convention and OPCW. Paul is also a founding member of the Fissile Material Working Group, which supported the 2010 Nuclear Security Summit.

Some of his articles include Abolishing Chemical Weapons: Progress, Challenges, and Opportunities, in Arms Control Today (November 2010) and The legacy of Reykjavik and the future of nuclear disarmament, (with Jonathan Hunt) in the Bulletin of the Atomic Scientists (December 2011).