Denis J. Halliday was the former United Nations Humanitarian Co-ordinator in Iraq (1997-1998).
Halliday has spent most of his long career with the United Nations in economic development and humanitarian assistance-related posts both in New York and overseas, primarily in South-East Asia.
Secretary-General Kofi Annan appointed Halliday to the post of United Nations Humanitarian Coordinator in Baghdad, Iraq as of 1 September 1997, at the Assistant Secretary-General level. In October 1998 he resigned after a 34 year career with the UN. He did so to free himself of the constraints imposed on him by the Secretary-General and thereby speak out publicly on the terrible impact of UN economic sanctions on the people of Iraq.
In 2000, Denis Halliday was nominated for the Nobel Peace Prize with Kathy Kelly of Voices in the Wilderness, the campaign against sanctions on Iraq.
Source -Wikipedia http://en.wikipedia.org/wiki/Denis_Halliday