The division director shall be secretary of the board and shall perform such other administrative duties as may be prescribed by the board. In a contested case, the division director on behalf of the board shall have the power to subpoena, throughout this state, witnesses, designated documents, papers, books, accounts, letters, photographs, objects, or other tangible things. All legal process and all documents required by law to be served upon or filed with the board shall be served upon or filed with the division director at his or her office.
OCGA § 43-33-9