Who is the head of the executive branch at the federal, state and local levels?

At the federal level, the head of the executive branch is the President of the United States.

At the state level, each state has a Governor who serves as the head of the executive branch.

At the local level, the head of the executive branch can differ depending on the specific structure of the local government. It may be a Mayor, County Executive, or other elected official with executive powers.