Hayden has been Special Representative of the Global Research Alliance on Agricultural Greenhouse Gases since 2016, representing its 65 member countries in all international forums and facilitating mitigation research between its members and partner organizations. From 2013 to 2016 he was New Zealand’s Ambassador to Argentina, Paraguay and Uruguay. Prior to these appointments Hayden gained considerable experience within the United Nations climate change process, representing New Zealand in agriculture, land use and forestry negotiations between 2006 and 2012. During this time (2010-2012) he was also based in the New Zealand Embassy in Paris where he represented New Zealand in other relevant processes and organizations including the OECD, UNEP and FAO, and spear-headed New Zealand’s international research cooperation on agricultural greenhouse gases. In addition to his international experience Hayden was involved in the development of New Zealand’s domestic agricultural climate change policy. Hayden is based in Montevideo, Uruguay.