Alexander Müller is the current head of a global study by the UN Environment Program on "The Economics of Ecosystems and Biodiversity for Agriculture and Food" (TEEBAgriFood). From 2006 to 2013 he served as Assistant-Director General of the Food and Agriculture Organization of the United Nations (FAO), where he was involved in the creation of the landmark Voluntary Guidelines for Responsible Governance of Tenure (VGGT). In June 2009 the UN Secretary-General nominated Müller as a member of the Advisory Group on Energy and Climate Change (AGECC) to advise on the energy-related dimensions of climate change negotiations. This constellation led to the creation of the forum “Sustainable Energy for All” (SEforALL). In 2017 he, along with Klaus Töpfer and Harmut Gaßner founded "TMG - Töpfer, Müller, Gaßner GmbH, ThinkTank for Sustainability" in Berlin, where he works as managing director.