 Metzl served as Deputy Staff Director and Senior Counselor of the United States Senate Committee on Foreign Relations, Senior Coordinator for International Public Information and Senior Advisor to the Undersecretary for Public Diplomacy and Public Affairs at the Department of State, and Director of Multilateral and Humanitarian Affairs on the National Security Council.In the Clinton Administration, he was the primary drafter of Presidential Decision Directive 68 on International Public Information and coordinated public information campaigns for Iraq and Kosovo.From 1991 to 1993, Metzl was a Human Rights Officer for the United Nations Transitional Authority in Cambodia (UNTAC), where he helped establish a human rights investigation and monitoring unit for Cambodia.