Nasser held different positions in two non-governmental organizations in Jerusalem before he joined the UN, gathering political support and money for the cause of Palestine and peace in the Middle East.

One of the longest serving veterans of the United Nations System; for more than 36 years, he has held various positions in Gaza, Jerusalem, Amman, Cairo, Vienna and New York City.

Prior to his current post, Nasser was the Director of the United Nations Information Service (UNIS) in Vienna from July 2008.

[2] Prior to that, he served as Director of the United Nations Information Centre (UNIC) in Cairo, Egypt from January 2006, leading a number of campaign with the Egyptian leadership at delicate political times.

In 2024, United Nations Secretary-General António Guterres designated Nasser as Commissioner-General for the organization’s participation in Expo 2025 in Osaka.