Section 630.025 - Director to head department - compensation - not to have private practice - director may conduct inquiries, issue subpoenas1. The head of the department shall be the director, whose salary shall be set by the commission at an amount not to exceed the appropriations made for that purpose. The director shall not provide consulting services outside his official employment, and his salary shall be the sole personal service income of the director; except, that the director shall not be prevented from receiving compensation from writing and presenting professional papers and publications.2. Before entering upon the discharge of his duties, the director shall take an oath to support the Constitution of the United States and the Constitution of the State of Missouri and to faithfully demean himself in the office to which he has been appointed.3. The director shall be the chief executive officer of the department and shall perform such duties and exercise such powers as may be imposed or conferred upon him by law.4. Except as otherwise provided by law, the director may request the governor to reorganize the internal organization of the department as authorized under sections 26.500 to 26.540.5. The director shall have power to make inquiries and investigations and to hold such hearings as may be necessary in pursuance of his duties, and for such purpose he may subpoena witnesses and documents, administer oaths and provide for payment and expense of witnesses.