|Mary Jane Theis|
|Justice of the Illinois Supreme Court|
|Assumed office |
October 26, 2010
|Judge of the Illinois Appellate Court, First District|
|Born||February 27, 1949|
Chicago, Illinois, US
|Spouse(s)||John T. Theis|
Theis became a judge in 1983, serving as Associate Judge (1983–1988), Circuit Court Judge (1988–1994), and Appellate Court Judge (1993–2010).  The Chicago Tribune endorsed her for election, citing her "universally accepted expertise on judicial ethics, family law, sentencing, fairness."  She previously served as Chair for the Illinois Judicial Conference's Committees on Education and Judicial Conduct, as well as on the Illinois Supreme Court's Rules Committee.  Her term expires in 2020.
Theis has taught at law schools in Chicago (Loyola University School of Law, Northwestern University School of Law, and the John Marshall Law School) and at Illinois and Chicago bar association conferences and seminars. 
Awards which Theis has received include a Lifetime Achievement Award from the Illinois Judges Association, the Mary Heftel Hooten Award from the Women's Bar Association of Illinois, and the Access to Justice Award from the Illinois State Bar Association. 
Theis is married to John T. Theis, and they have two children and four grandchildren. 
- "The 7 justices of the Illinois Supreme Court". Chicago Sun-Times. Retrieved December 26, 2013.
- "Eleanore Wendt". Chicago Tribune. February 26, 1992. Retrieved December 26, 2013.
- Merrion, Paul (January 24, 2015). "How will Illinois' high court rule on pension reform?". Crain's Chicago Business. Retrieved May 8, 2016.
- "Mary Jane Theis, Supreme Court Justice First District". Illinois Courts. Archived from the original on December 27, 2013. Retrieved December 26, 2013.
- "Bring some order to the court: Endorsements for Cook County judges". Chicago Tribune. October 21, 2012.
- "Mary Jane Theis". VoteSmart.org.
- "Justice Mary Jane Theis". Loyola University Chicago. Retrieved May 8, 2016.
- "Mary Jane Theis, Supreme Court Justice First District". Illinois Courts. Archived from the original on 2013-12-27.
- "Justice Mary Jane Theis". Loyola University Chicago.
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