The 12th
Generally speaking in most US cities, the title of Mayor is held by a city's chief executive. It's a position requiring an election.
The President of the United States, except during time of disability under the 25th Amendment, at which point in time the chief officer of the executive branch is the Acting President of the United States.
The plural of "chief executive" is "chief executives"
The Twenty-second Amendment (Amendment XXII) of the United States Constitution sets a term limit for the President of the United States.
There are different titles for the chief executive. In some countries the chief executive is call president. In many companies, he or she is called the chief executive or chief executive officer.
Individually, chiefs, executives, officers. Collectively, Chief Executive Officers
Chief Executive Officer
The US Government Chief Executive is the President.
The President is chief executive of the Executive Branch of the US government.
Jimmy Carter
CEO: Corporate Executive Officer
Chief executive or chief executive officer (CEO).