Richard Merrill Mills Jr. is an American diplomat who serves as the United States deputy ambassador to the United Nations. He served as the U.S. Chargé d'Affaires and Acting Permanent Representative to the United Nations between January 20, 2021, and February 24, 2021, when Linda Thomas-Greenfield became ambassador. In July 2022, he was announced as the nominee to serve as the United States ambassador to Nigeria.

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.