Linda Thomas-Greenfield is an American diplomat who serves as the United States ambassador to the United Nations under President Joe Biden. She served as the U.S. assistant secretary of state for African affairs from 2013 to 2017. Thomas-Greenfield then worked in the private sector as a senior vice president at business strategy firm Albright Stonebridge Group in Washington, D.C.

The Assistant Secretary for the Bureau of African Affairs is the head of the Bureau of African Affairs, within the United States Department of State, who guides operation of the U.S. diplomatic establishment in the countries of sub-Saharan Africa and advises the Secretary of State and the Under Secretary for Political Affairs.