The VIC currently houses a number of International Organizations: Having been established in 1957, the International Atomic Energy Agency (IAEA, current Director-General Yukiya Amano) was the first of the International Organizations to be based in Vienna and, with its 2.550 employees, it is still the largest. Over the past few years, the IAEA has shifted its emphasis from the promotion of atomic energy to nuclear safety and the prevention of the improper use of fissile material.
Another Vienna-based organisation is the United Nations Industrial Development Organisation (UNIDO), which was set up in 1966 and is currently headed by Li Yong. This is the only organisation within the UN system to provide support for industrialisation in Third World countries and in the Central and Eastern European transition countries through technical assistance, consultation and mediation as well as research and study programmes aimed at the most eco-friendly industrialisation on the one hand, and through the promotion of industrial co-operation between developing and industrialised countries on the other.
The UNOV Secretariat unit (United Nations Office at Vienna), set up at the opening of the VIC in 1979, gives administrative support to various UN bodies and institutions, and is responsible for conference planning and interpretation services for more than 2,000 conferences and meetings a year as well as for the security services at the Vienna International Centre. UNOV also includes the Office for Outer Space Affairs (OOSA), the Division of Administrative and Common Services (DACS) and the United Nations Information Service (UNIS).
Secretariat units which report to other Secretariat entities include the United Nations Commission on International Trade (UNCITRAL) and the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). Apart from the above-mentioned organisations of the UN family, the VIC also houses the branch-office of the United Nations Office for Project Services (UNOPS) and the regional bureau of the United Nations High Commissioner for Refugees (UNHCR).
In the course of the reforms of the United Nations, in 1997 Vienna became a major centre of all UN efforts aimed at combating crime, drug abuse and terrorism. As a result, the Office for Drug Control and Crime Prevention (ODCCP), renamed the ODC/Office on Drugs and Crime (UNODOC) in autumn 2002, was set up in Vienna. Since 2010 it has been headed by Yury Fedotov as Executive Director, who at the same time holds the offices of Under-Secretary-General and Director-General of the UNOV (United Nations Office at Vienna). The ODC consists of the United Nations International Drug Control Programme (UNDCP) and the Centre for International Crime Prevention (CICP).
Since 1997 the Preparatory Commission of the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO) has been operating in Vienna. A sophisticated data centre is attached to the secretariat. Lassina Zerbo took office as Executive Secretary in summer 2013.
The International Commission for the Protection of the Danube River (ICPDR), founded in 1998, is engaged in ensuring sustainable and ecological management of the Danube River. Besides, it supervises the implementation of the Danube River Protection Convention, signed in 1994, and the EU Water Framework Directive (2000/60/EG).