Final answer:
The President of the United States is the administrative head of the executive branch, which includes numerous agencies and the 15 executive departments. The President appoints heads of these departments and agencies, subject to Senate approval, and oversees the extensive bureaucracy.
Step-by-step explanation:
The administrative head of the executive branch of the Government, which includes numerous agencies as well as the 15 executive departments, is the President of the United States. The executive branch has expanded significantly since the 1930s and 1940s and is now composed of 15 Cabinet-level departments, over 60 government agencies, and numerous other subunits and bureaus. Although there is debate over the exact number, there are over two million civilian employees, with only a fraction located in Washington, D.C. The others are distributed throughout the country and globally. Apart from managing the overall executive branch, the President is responsible for the appointment of heads of departments and agencies, with Senate approval, who then oversee the different aspects of the federal bureaucracy.
The President's Cabinet includes the Vice President and the heads of the executive departments, who are referred to as secretaries, except for the head of the Department of Justice, who is known as the Attorney General. The President also delivers the State of the Union Address to propose legislative agendas, which can influence the development, consolidation, or elimination of departments and agencies. Furthermore, the President exerts control over the vast federal bureaucracy by appointing the heads of the cabinet departments and independent executive agencies such as the CIA, the EPA, and the FBI, subject to Senate confirmation.