On 8 June 2015, Mr. Nikhil Seth was appointed by the United Nations Secretary-General Ban Ki-moon as UN Assistant Secretary-General, Executive Director of the United Nations Institute for Training and Research.

Before assuming the post of the UNITAR Executive Director, Nikhil Seth was the Director of the Division for Sustainable Development, Department of Economic and Social Affairs (DESA) at the United Nations Secretariat in New York. In this role he served as head of the Rio+20 secretariat and of the secretariat for the Third International Conference on Small Island Developing States, spearheading the preparations for these conferences in Rio, Brazil, and Apia, Samoa. He was also closely engaged in coordinating and advancing their follow-up.

Mr. Seth’s Division was also responsible for supporting the intergovernmental negotiations for the post-2015 development agenda, which was adopted at the United Nations Sustainable Development Summit 2015 in September 2015.

During his career with the United Nations since 1993, Mr. Seth has served as Special Assistant and Chief of Office to the Under-Secretary-General for Economic and Social Affairs (Sept 1993 – Jun 2001), Chief of the Policy Coordination Branch in the Division for ECOSOC Support and Coordination (Jun 2001 – Jan 2003), as Secretary of the Economic and Social Council (ECOSOC) and the Second Committee of the General Assembly (Feb 2003 – Aug 2006), and as Director of the DESA Office for ECOSOC Support and Coordination (Aug 2006 – Aug 2011), where he guided the ECOSOC's work in implementing several new key mandates, including its Annual Ministerial Review and Development Cooperation Forum.

Before joining the UN Secretariat, he was a delegate to the UN in the Permanent Mission of India to the United Nations (Sep 1990 – Sep 1993) and involved with various UN conferences and summits including the Rio Summit on Environment and Development and the climate change related process.   After joining the UN, he has been involved in the organization of the Copenhagen Summit on Social Development, the Monterrey Conference on Financing for Development, the Mauritius Conference on Small Island Developing States, the Millennium Summit, World Summit on Sustainable Development and the UN World Summit, beside the Rio+20 Conference.

He joined the Indian diplomatic service in 1980 and his diplomatic assignments included Geneva, Democratic Republic of Congo, Central African Republic, Gabon and Equatorial Guinea.

Before joining the Indian diplomatic service, he worked as a Lecturer in Economics in St. Stephen College, Delhi University for 2 years (Aug 1977 – Sep 1979).

Mr. Nikhil Seth holds a Masters degree in Economics from Delhi University.