Who is the Chief Justice of the Illinois Supreme Court?

Mary Jane Theis serves as the Chief Justice of the Illinois Supreme Court. She became the Chief Justice after being elected by her peers on the court, demonstrating her leadership and extensive experience within the judiciary system. Appointed to the Illinois Supreme Court in 2010, Theis has a long history in the legal field, including her previous role as an Illinois Appellate Court judge. Her leadership as Chief Justice involves overseeing the administration of the court as well as guiding discussions on important judicial matters.

Other figures mentioned, such as Lisa Madigan, a former Attorney General, and Robert Thomas, a former Justice of the Illinois Supreme Court, are not currently serving in the role of Chief Justice, which further highlights why Mary Jane Theis is the correct answer. Anne Burke, while a notable Justice, has not held the position of Chief Justice either.