Mary Jane Theis | |
|---|---|
 2010 portrait | |
| Chief Justice of the Illinois Supreme Court | |
| Assumed office October 26, 2022 | |
| Preceded by | Anne M. Burke |
| Justice of the Illinois Supreme Court | |
| Assumed office October 26, 2010 | |
| Preceded by | Thomas Fitzgerald |
| Justice of the Illinois 1st District Appellate Court | |
| In office 1993 – October 2010 | |
| Judge of the Cook County Circuit Court | |
| In office 1988–1993 | |
| Associate Judge of the Cook County Circuit Court | |
| In office 1983–1988 | |
| Personal details | |
| Born | Mary Jane Wendt February 27, 1949 Chicago, Illinois, U.S. |
| Political party | Democratic |
| Spouse | John Theis |
| Relatives | Ken Wendt (father) |
| Education | Loyola University Chicago (BA) University of San Francisco (JD) |
Mary Jane Theis (born February 27, 1949) is a justice of the Illinois Supreme Court for the First Judicial District in Cook County. In 2022, she became chief justice after the retirement of then-chief justice Anne M. Burke.