He is an SDG Advocate for United Nations (UN) Secretary-General António Guterres on the Sustainable Development Goals (SDGs), a set of 17 global goals adopted at a UN summit meeting in September 2015. From 2001 to 2018, Sachs served as Special Advisor to the UN Secretary General, and held the same position under the previous UN Secretary-General Ban Ki-Moon and prior to 2016 a similar advisory position related to the earlier Millennium Development Goals (MDGs), eight internationally sanctioned objectives to reduce extreme poverty, hunger and disease by the year 2015. In connection with the MDGs, he had first been appointed special adviser to the UN Secretary-General in 2002 during the term of Kofi Annan.