He was responsible for managing the largest and most challenging UN election operation ever undertaken by the United Nations in 2006 in Congo, which brought Joseph Kabila to power.
[2] Prior to his assignment in Congo, Mountain replaced Sergio Vieira De Mello, the UN Commissioner for Human Rights, at the time serving as a Special Representative of the Secretary General in Iraq who was killed in Baghdad by a terrorist attack on the UN Headquarters on 19 August 2003.
[7] In October 2002, Mountain led an inter-agency technical assessment mission to the West Bank and Gaza to prepare a humanitarian plan of action.
[8] In 2003, Mountain headed the OCHA Crisis Task Team for Iraq, in which capacity he visited that country in July 2003 to review the humanitarian programme.
[9] From January 2010 to December 2012, Mountain served as Director General of DARA (international organization), an independent humanitarian think tank based in Madrid, Spain.