Mary Jane Theis
Mary Jane Theis | |
|---|---|
| Chief Justice of the Illinois Supreme Court | |
| In office October 26, 2022 – October 26, 2025 | |
| Preceded by | Anne M. Burke |
| Succeeded by | P. Scott Neville Jr. |
| Justice of the Illinois Supreme Court | |
| In office October 26, 2010 – January 29, 2026 | |
| Preceded by | Thomas Fitzgerald |
| Succeeded by | Sanjay Tailor |
| Personal details | |
| Born | Mary Jane Wendt February 27, 1949 Chicago, Illinois, U.S. |
| 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 former 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. Theis announced on January 12th, 2026, that she would resign from the Illinois Supreme Court effective January 29, 2026.