Kristen Silverberg was the United States Ambassador to the European Union from July 2008 until January 2009. She was nominated by President George W. Bush on April 24, 2008 and confirmed by the United States Senate on June 27, 2008. On July 22, 2008, she presented her credentials. She was succeeded by William Kennard who was nominated by President Barack Obama on August 6, 2009 and confirmed by the United States Senate on November 20, 2009.

William Earl Kennard is an American attorney and former government official. Kennard served as chairman of the Federal Communications Commission (FCC) from 1997 to 2001 under President Bill Clinton, and was the first African American to lead the agency. In 2009, Kennard was appointed by President Barack Obama to serve as Ambassador to the European Union, serving until 2013.