70 ILCS 1855/20
The Governor, by and with the consent of the Senate, shall appoint the members of the Board and fill any and all vacancies. If the Senate is in recess when such appointment is made, the Governor shall make a temporary appointment until the next meeting of the Senate. All initial appointments shall be made within 60 days after this Act takes effect. Of the members initially appointed by the Governor, 3 shall be appointed for initial terms expiring July 1, 1962, 2 for initial terms expiring July 1, 1963 and 2 for initial terms expiring July 1, 1964. At the expiration of the term of any member, his successor shall be appointed by the Governor in like manner and with like regard to place of residence of the appointee, as in the case of appointments for the initial terms.
After the expiration of initial terms, each successor shall hold office for the term of 3 years beginning the first day of July of the year in which the term of office commences. In the case of a vacancy during the term of office of any member, the Governor shall make an appointment for the remainder of the term vacant and until a successor is appointed and qualified.
No more than 4 of the members shall be affiliated with the same political party at the time of appointment.
The Governor shall certify his appointments to the Secretary of State. Within 30 days after certification of his appointment, and before entering upon the duties of his office, each member of the Board shall take and subscribe the constitutional oath of office and file it in the office of the Secretary of State.
70 ILCS 1855/20