Illinois constitution
Article VI
Section 16

General administrative and supervisory authority over all
courts is vested in the Supreme Court and shall be exercised
by the Chief Justice in accordance with its rules. The
Supreme Court shall appoint an administrative director and
staff, who shall serve at its pleasure, to assist the Chief
Justice in his duties. The Supreme Court may assign a Judge
temporarily to any court and an Associate Judge to serve
temporarily as an Associate Judge on any Circuit Court. The
Supreme Court shall provide by rule for expeditious and
inexpensive appeals.