The Small Business Advocate, with the approval of the Secretary of Commerce, shall appoint attorneys as assistant small business advocates, and such additional clerical, technical and professional staff as may be appropriate, and may contract for such additional services as shall be necessary for the performance of his function. The compensation of assistant small business advocates and such clerical, technical and professional staff shall be set by the Executive Board. No assistant small business advocate or other staff employee shall, while serving in such position, engage in any business, vocation or other employment, or have other interests, inconsistent with his official responsibilities.