Once a bill has been passed by Congress and signed by the President, it becomes a law. It is the job of the executive branch to ensure the provisions of the law are enacted or carried out.
The person who is ultimately responsible for this happening is the President. The President has lots of departments, agencies, and people to help him be sure the law is properly enacted. These departments and agencies are responsible for knowing what the law specifically requires. Then, they go out and provide the necessary level of support to be sure the provisions of the law are enacted and followed.
The President is responsible for appointing the leaders of the various departments and agencies that will carry out the law. The head of the department or agency hires workers to do the job. Many federal workers get their employment through the civil service system. Thus, indirectly, a very sizeable number of people are under the supervision and control of the President.
The Executive Branch consists of the President and the Vice President. After a bill is passed by Congress and signed by the President it becomes law. The Executive Branch is responsible for implementing the laws in which he appoints persons to carry out the laws. Under Article II of the Constitution, the President is responsible for the execution and enforcement of the laws created by Congress. Fifteen executive departments — each led by an appointed member of the President's Cabinet — carry out the day-to-day administration of the federal government. They are joined in this by other executive agencies such as the CIA and Environmental Protection Agency, the heads of which are not part of the Cabinet, but who are under the full authority of the President. The President also appoints the heads of more than 50 independent federal commissions, such as the Federal Reserve Board or the Securities and Exchange Commission, as well as federal judges, ambassadors, and other federal offices. The Executive Office of the President (EOP) consists of the immediate staff to the President, along with entities such as the Office of Management and Budget and the Office of the United States Trade Representative.