105 ILCS 5/33-3

At the first regular meeting of the board in July of each year, or as soon thereafter as may be, the board shall choose 1 of its number as president, and shall appoint a secretary and a treasurer, who need not be members of the board. The president, secretary and treasurer shall hold their offices for 1 year and until their successors are appointed and qualified. They shall be subject to removal by a majority of all the members and in case of removal or where a vacancy otherwise occurs in either of the offices the board shall appoint a successor to fill the vacancy.