Mary Kay O'Brien | |
|---|---|
 | |
| Justice of the Illinois Supreme Court | |
| Assumed office December 5, 2022 | |
| Preceded by | Robert Carter |
| Judge of the Illinois Appellate Court for the 3rd district | |
| In office December 26, 2003 – December 5, 2022 | |
| Preceded by | Thomas J. Homer |
| Succeeded by | Linda Davenport |
| Member of the Illinois House of Representatives from the 75th district | |
| In office January 1997 – December 17, 2003 | |
| Preceded by | Stephen Spangler |
| Succeeded by | Careen M. Gordon |
| Personal details | |
| Born | June 4, 1965 Kankakee, Illinois, U.S. |
| Political party | Democratic |
| Education | Joliet Junior College Western Illinois University (BA) University of Illinois, Urbana-Champaign (JD) |
Mary Kay O'Brien (born June 4, 1965) is an American judge and politician who serves as a justice of the Illinois Supreme Court since 2022.