Date of Birth: 
About Mary K. O'Brien
- Mary K.
- O'Brien (born June 4, 1965) is an American judge and politician. Born in Kankakee, Illinois, O'Brien grew up on a farm in Reddick, Illinois.
- She graduated from Reddick High School and went to Joliet Junior College.
- O'Brien received her bachelor's degree from Western Illinois University in 1986 and her law degree from the University of Illinois College of Law in 1994.
- From 1997 to 2003, O'Brien served in the Illinois House of Representatives and was a Democrat.
- On December 26, 2003, O'Brien was appointed to the Illinois Appellate Court.
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