Final answer:
The President of the United States is the head of the National Security Council, which is a key component in shaping U.S. foreign policy and national security.
Step-by-step explanation:
The leader who heads the National Security Council (NSC) is the President of the United States. The NSC is a group of senior-level staff from multiple foreign policy agencies, including the national security advisor, the State Department, the Defense Department, the Department of Homeland Security, and the intelligence agencies. The National Security Act of 1947 established the NSC, and it has been a key component of the foreign policy-making structure, particularly after reorganizations following the events of 9/11.
The council's primary role is to advise the president on national security and foreign policies. The NSC also includes the Secretary of State, the Secretary of Defense, and the Director of National Intelligence, among others, who work closely with the president to shape the United States' foreign policy and ensure the security of the nation.