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The title of the person appointed by the court to settle the estate of a person who left a will is the executor.
The title of the person in charge of the opposition is the leader of the opposition. This is the term that is used in most countries. The opposition serves as a watchdog to the government.
Icelander
Police comissioner
a soundtrack person or the person who is in charge of the music department for that film
The head person in charge of a prison is typically referred to as the warden. This individual is responsible for overseeing the day-to-day operations of the prison, including security, inmate supervision, and facility management.
The Queen or someone on behalf of her.
I believe this is the Quartermaster.
A gaoler (or jailer) is a person in charge of prisoners or the prison.
CFO or Chief Financial Officer
(in the US) The state governments are in charge of their respective state prison systems, the federal government is in charge of the federal prison system.
The CEO, President or person with a similar title is the head of a modeling agency.