Mo. Rev. Stat. § 356.081

A professional corporation or foreign professional corporation may render a professional service in this state only through natural persons permitted to render such service in this state; but nothing in sections 356.011 to 356.261 shall be construed to require that any person who is employed by a professional corporation or foreign professional corporation be licensed to perform services for which no license is otherwise required or to prohibit the rendering of a professional service by a licensed natural person acting in his individual capacity, notwithstanding such person may be a shareholder, director, officer, employee or agent of a professional corporation or foreign professional corporation.