Subject to the availability of funding appropriated therefor, the board may hire a director of the school, who shall serve at the will and pleasure of the board. The director shall be the chief administrative officer of the school and shall administer the school in accordance with the policies established by the board. The director shall be responsible for those administrative duties and functions prescribed by the board, and the board, in its discretion, may delegate to the director such powers and duties as it deems appropriate.