(a) No individual may be a director or officer of a professional service corporation unless he is authorized by law to practice in this state a profession which such corporation is authorized to practice and is either a shareholder of such corporation or engaged in the practice of his profession in such corporation.

(b) The directors and officers of a design professional service corporation may include individuals who are not design professionals, provided however that greater than seventy-five percent of the directors, greater than seventy-five percent of the officers and the president, the chairperson of the board of directors and the chief executive officer or officers are authorized by law to practice in this state a profession which such corporation is authorized to practice, and are either shareholders of such corporation or engaged in the practice of their professions in such corporation.