805 ILCS 305/8
A professional association organized pursuant to the provisions of this Act shall be governed by a Board of Directors or an Executive Committee elected by the members, and represented by officers elected by the Board of Directors or Executive Committee, so that centralization of management will be assured, and no member shall have the power to bind the association within the scope of the association's business or profession merely by virtue of his being a member of the association. Officers and members of the Board of Directors or Executive Committee shall be members of the professional association. Officers need not be members of the Board of Directors or Executive Committee except that the President shall be a member of the Board of Directors or Executive Committee. The members may adopt such by-laws as they may deem proper, or the power to promulgate by-laws of the association may be delegated by the articles of association to the Board of Directors or Executive Committee of the professional association, as the members may decide. Each member shall have such power to cast such vote or votes at the meeting of the members as the articles of association shall provide. The officers of the professional association may employ such agents or employees of the association as they may deem advisable. The officers of the association shall include a President, Vice President, Secretary, Treasurer, and such other officers as the Board of Directors or Executive Committee may determine. Any one person may serve in more than one office provided that the President and the Secretary of the professional association shall not be the same person.
805 ILCS 305/8