Mo. Rev. Stat. § 262.844
The board shall meet in Jefferson City within sixty days of the effective date of this act to elect a chairperson and vice chairperson of the board. The committee shall thereafter meet annually, within sixty days of July first, to elect officers and conduct business of the board. Additional meetings shall be held at the call of the chairperson or whenever two board members so request. Six members of the board shall constitute a quorum, and any action taken by the board under the provisions of sections 262.820 to 262.859 may be authorized by resolution approved by a majority, but not less than five, of the board members present at any regular or special meeting. In the absence of the chairman, the vice chairman may preside over the annual meeting of the board or in the absence of the chairman, any meeting requested by two or more commissioners. No vacancy in the membership of the board shall impair the right of a quorum to exercise all the rights and perform all the duties of the board.
§ 262.844, RSMo