Michael Okerlund Leavitt is an American Republican Party politician who served as the 14th governor of Utah from 1993 to 2003, and in the George W. Bush administration as Administrator of the Environmental Protection Agency (EPA) from 2003 to 2005 and as Secretary of Health and Human Services (HHS) from 2005 to 2009.

The administrator of the Environmental Protection Agency is the head of the United States Environmental Protection Agency (EPA), and is thus responsible for enforcing the nation's Clean Air and Clean Water Acts, as well as numerous other environmental statutes. The administrator is nominated by the president of the United States and must be confirmed by a vote of the Senate.