Since the late 1980s, Dorsey has worked with firms, non-profits, foundations, governments and a multitude of others on the interplay of multilateral environment policy, finance and economic development matters across the Americas, Africa, Asia and Europe. In 1991, Dorsey served as a youth delegate to the U.S. First National People of Color Environmental Leadership Summit. In 1992, Dorsey served as the youngest NGO representative on the United States Department of State Delegation the Earth Summit in Rio de Janeiro, Brazil. In 1993, Dorsey served on the task force for Bill Clinton's Council on Sustainable Development. In the mid-1990s Dorsey worked at the African Centre for Technology Studies at the request of the Centre's founder Calestous Juma.