In 1986 he was appointed minister to Qatar's permanent mission to the United Nations.
He left office in 1993 to become ambassador to Jordan.
On 11 September 1998, he was appointed as ambassador and permanent representative to the United Nations by Hamad bin Jassim bin Jaber Al Thani, then foreign minister.
During his office at the United Nations, Al-Nasser has served as chairman of the delegation of Group of 77 and China, Vice-President of the General Assembly in 2002, and President of the Security Council in December 2006.

He was appointed as High Representative for the Alliance of Civilizations of the United Nations by the UN Secretary-General Ban Ki Moon on 28 September 2012.
In 1986 he was appointed minister to Qatar's permanent mission to the United Nations. He left office in 1993 to become ambassador to Jordan. On 11 September 1998, he was appointed as ambassador and permanent representative to the United Nations by Hamad bin Jassim bin Jaber Al Thani, then foreign minister. During his office at the United Nations, Al-Nasser has served as chairman of the delegation of Group of 77 and China, Vice-President of the General Assembly in 2002, and President of the Security Council in December 2006. 
He was appointed as High Representative for the Alliance of Civilizations of the United Nations by the UN Secretary-General Ban Ki Moon on 28 September 2012.
Nassir Abdulaziz Al-Nasser