Member of South Africa’s delegation to the 1995 NPT review conference.

Polish ambassador and chairman of the Drafting Committee at the 1995 NPT review conference.

Chairperson of the subcommittee for "Disarmament, Arms Control, and Nonproliferation" of the Foreign Affairs Committee of the German Bundestag.

One of the drafters of the Treaty on Non-Proliferation of Nuclear Weapons.

Co-founder of the Programme for Promoting Nuclear Non-Proliferation (PPNN) and advisor to the Conference President Dhanapala.

Ambassador and Permanent Representative of the Kingdom of the Netherlands to the Conference on Disarmament in Geneva.

Expert member of the German delegation to the NPT review conference.

Former US Ambassador to South Africa.

Senior Advisor for Non-proliferation and Deputy Director of the Non-proliferation, Arms Control and Disarmament Division of the Canadian Department of Foreign Affairs.

Untied States special representative for Arms Control, Non-Proliferation, and Disarmament.