Operator (noun)

1. A person who operates a machine, especially a machine requiring special skill.
2. A person who runs a business or other organization.
3. A person who performs a specified role in a particular process or system.

Origin:

Late 16th century (as a noun denoting a person who manages a machine): from latin operat- 'worked', from the verb operari.

Examples:

1. The machine operator was trained to use the equipment safely.
2. The company operator is responsible for the overall management of the business.
3. The telephone operator assisted the caller in connecting to the correct number.
4. The operator of the website is responsible for its content and updates.
5. The bank operator helped the customer with their transaction.