A Supervisor

1. (management) A person with the official task of overseeing the work of a person or group, or of other operations and activities. Supervisor - Wikipedia
2. A person who monitors someone to make sure they comply with rules or other requirements set for them.
3. (US) In certain states, an elected member of the governing body for a county which is called the board of supervisors.
4. (computing) A process responsible for managing other processes.