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

Expert Advisor to Canada’s delegation to the 1995 review conference.

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

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

Member of the US Delegation to the 1995 NPT RevCon