Grundy County

Official Website of Grundy County Government Offices

Peter D. Siena, JD

Assistant State's Attorney

Assistant State’s Attorney Peter D. Siena received his bachelor’s degree from the University of Illinois and his Juris Doctorate from DePaul University College of Law.

He began his legal career, while completing his law degree, as a Mediator for the Center for Conflict Resolution in Chicago, IL.

Prior to joining the Grundy County State’s Attorney’s Office in June 2010, Mr. Siena served the LaSalle County State’s Attorney’s Office for over ten years, where he prosecuted a wide variety of cases.

Assistant State’s Attorney Siena has experience in not only the Traffic and Juvenile Divisions, but also the Domestic Violence and Deceptive Practice Divisions. While at the LaSalle County State’s Attorney’s Office, he also spent several years prosecuting felony and misdemeanor drug cases.

Since joining the Grundy County State’s Attorney’s Office, Mr. Siena manages all Class 3 & 4 Felonies.

Assistant State’s Attorney Siena is a member of both the LaSalle County Bar Association and the Grundy County Bar Association.