20 ILCS 3105/5
The Board shall consist of 7 members, no more than 4 of whom may be of the same political party, all of whom shall be appointed by the Governor, by and with the consent of the Senate, and one of whom shall be designated as chairman by the Governor. No person may be appointed as a member of the Board who is serving as an elected officer for the State or for any unit of local government within the State.
If the Senate is not in session when the first appointments are made, the Governor shall make temporary appointments as in the case of a vacancy. In making the first appointments, the Governor shall designate 2 members to serve until January, 1974, 2 members to serve until January, 1975, 2 members to serve until January, 1976 and 1 member to serve until January, 1977, or until their successors are appointed and qualified. Notwithstanding any provision of law to the contrary, the term of office of each member of the Board is abolished on January 31, 2019. Incumbent members holding a position on the Board on January 30, 2019 may be reappointed. In making appointments to fill the vacancies created on January 31, 2019, the Governor shall designate 2 members to serve until January 31, 2021, 2 members to serve until January 31, 2022, 2 members to serve until January 31, 2023, and one member to serve until January 31, 2024, or until their successors are appointed and qualified. Their successors shall be appointed to serve for 4 year terms expiring on the third Monday in January or until their successors are appointed and qualified. Any vacancy occurring on the Board, whether by death, resignation or otherwise, shall be filled by appointment by the Governor in the same manner as original appointments. A member appointed to fill a vacancy shall serve for the remainder of the unexpired term or until his successor is qualified.
20 ILCS 3105/5