On Isla Nublar there were a variety of offices located inside of the Visitor’s Center. One of these was labeled ‘Park Supervisor’. It is unknown what services this office provided exactly. The Park supervisor would be tasked with managing duties such as hiring or firing employees, or working with employees. Also, the supervisor would most likely work with the employees schedules. They would also take on tasks such as researching new rides or exhibitions for the park as a whole, presenting their final ideal to the General Manager for approval.
Jurassic Park by Michael Crichton page 97 (First Edition, Thirty Fourth printing)