Mr. Hart has served as a Senior Foreign Service Officer in the Barbados Foreign Service and Counsellor at the Permanent Mission of Barbados to the United Nations, where he was responsible for Economic and Financial Affairs. Mr. Hart also served as the Chief Climate Change Negotiator for Barbados as well as the Coordinator and Lead Negotiator on Finance for the Alliance of Small Island Developing States (AOSIS), a coalition of 43 Islands and low-lying coastal states in the Caribbean, Pacific, Africa, Indian Ocean and South China Sea. He was a member of the Kyoto Protocol Adaptation Fund Board from 2009 to 2010 and was elected by the UN General Assembly to serve as Vice-Chairman of the 2nd Committee of the UNGA (Economic and Financial) during its 60th Session.