Question: What is the nationality of the person who head 's the International Atomic Energy Agency which is based in Vienna ?

text: List of United Nations organizations
Specialised organisations and agencies
The United Nations maintains and supports a number of specialized organizations and agencies . These differ from the programmes and funds in that they are headed by an executive board of member states , separate from the General Assembly . Sometimes they do not report to the General Assembly or Security Council but only to their own member states . Some of these bodies also predate the United Nations as is the case for the ITU formed in 1865 to administer an international treaty and the ILO created as part of the League of Nations .
The United Nations established six principal organs of the Organization: the General Assembly, the United Nations Security Council, the Economic and Social Council, the United Nations Trusteeship Council (this Council suspended operations in 1994), the International Court of Justice, and the Secretariat. The Charter allowed for the creation of any other entities that were seen as required. Since its creation, the United Nations is now considerably larger, encompassing numerous specialised organisations and agencies, programmes and funds, training and research bodies as well as other service providers. There are also numerous subsidiary bodies, including committees, commissions, boards, councils, panels, and working groups some of which this list includes. This list is a work in progress and should be cross checked with other sources. (A more comprehensive list is available at the United Nations System article. )It has many organisations
No Acronyms Agency Headquarters Head Established
1 FAO Food and Agriculture Organization Rome , Italy Qu Dongyu 1946
2 IAEA International Atomic Energy Agency Vienna , Austria Yukiya Amano 1957
3 ICAO International Civil Aviation Organization Montreal , Quebec , Canada Fang Liu 1947
4 IFAD International Fund for Agricultural Development Rome , Italy Gilbert F. Houngbo 1977
5 ILO International Labour Organization Geneva , Switzerland Guy Ryder 1919
6 IMO International Maritime Organization London , United Kingdom Kitack Lim 1948
7 IMF International Monetary Fund Washington , D.C. , United States Kristalina Georgieva 1945
8 ITU International Telecommunication Union Geneva , Switzerland Houlin Zhao 1865
9 UNESCO United Nations Educational , Scientific and Cultural Organization Paris , France Audrey Azoulay 1945
10 UPU Universal Postal Union Bern , Switzerland Bishar Abdirahman Hussein 1947
11 WBG World Bank Group Washington , D.C. , United States David Malpass 1945
12 WIPO World Intellectual Property Organization Geneva , Switzerland Francis Gurry 1974
13 WMO World Meteorological Organization Geneva , Switzerland David Grimes 1950
14 UNWTO United Nations World Tourism Organization Madrid , Spain Zurab Pololikashvili 1974
15 UNODC United Nations Office on Drugs and Crime Vienna , Austria Yuri Fedotov 1997
16 WHO World Health Organization Geneva , Switzerland Tedros Adhanom 1948
17 UNHCR Office of United Nations High Commissioner for Refugees Geneva , Switzerland Filippo Grandi 1950
18 WFP Office of United Nations World Food Program Rome , Italy David Beasley 1961
19 UNIDO United Nations Industrial Development Organization Vienna , Austria Li Yong 1966