Achim Steiner became UNDP administrator in 2017. He is also the vice chair of the United Nations Sustainable Development Group, which unites 40 entities of the UN system that work to support sustainable development. Prior to joining UNDP, he was director of the Oxford Martin School and professorial fellow of Balliol College, University of Oxford. Steiner led the United Nations Environment Programme (2006–2016), and was also director-general of the United Nations Office in Nairobi. He previously held other notable positions including director-general of the International Union for the Conservation of Nature and secretary-general of the World Commission on Dams.