John grew up on Broadway Street in Joliet, and after graduating from Joliet Catholic Academy in 1988, he obtained a bachelor’s degree in history from Notre Dame in 1992,and his law degree from the University of Illinois in 1995.
After private practice on the island of Saipan, he returned to Will County in 1997 and joined the State’s Attorney’s Office. Over the next 20 years, John became a career prosecutor and the Major Crimes Chief at the Will County State’s Attorney’s Office. He handled several high profile cases including the Drew Peterson case, the “Hickory Street Stranglings,” and pretrial proceedings in the Christopher Vaughn case.
Anticipating that the Peterson case would require additional resources, John drafted an order for the first Will County special grand convened in decades in November of 2007, immediately after the disappearance of Stacy Peterson. That grand jury indicted Peterson on the charges John presented in 2009 for the murder of Peterson’s third wife, Kathleen Savio.
John also used his experience with computer forensic evidence as both a local prosecutor and an Assistant Attorney General in the High Tech Crimes Bureau to design guidelines for the State’s Attorney’s Computer Crimes Unit, which executed more than 100 search warrants and convictions for child exploitation crimes. He also oversaw cold case murder investigations during his tenure. An advocate of the grand jury as a citizen’s tool for justice, he presented many investigations and their witnesses to grand juries for their assistance and involvement during his tenure as a prosecutor.