Highland Park Man, Northwestern Lab Director, Charged With Child Porn Possession

A 41-year-old Highland Park man who has directed a Northwestern University engineering facility since 2015 has been charged with three counts of possession of child sex abuse material after authorities searched his home on the 700 block of Ridge Road and seized several electronic devices. Stephen Miller was taken into custody Wednesday, and prosecutors are now seeking to keep him detained ahead of a Thursday morning court hearing.

According to WGN-TV, authorities began investigating in June 2026 and allege that Miller downloaded and shared several items of child sexual abuse material. Investigators obtained a search warrant for his Highland Park home and executed it Wednesday, seizing multiple electronic devices as part of the case, the station reports.

Miller is a Northwestern University staff member and director who, per the state attorney's office and his LinkedIn profile, has led the university's Laser and Electronics Design Core Facility, known as NU-LED, since 2015 and also does classroom teaching. The facility he oversees is a 700-square-foot engineering shop managed under Northwestern's Department of Chemistry that provides custom electronic device design, instrument repair, and technical fabrication for staff, faculty, postdocs, and students across the university, according to Northwestern's own program materials. Miller also held the academic title of Research Associate Professor within Northwestern's Integrated Molecular Structure Education and Research Center, or IMSERC, which oversees several of the university's core scientific research labs.

Award-Winning Facility, Now Facing Scrutiny

NU-LED received Northwestern's Office for Research Core Facilities Service Excellence Award in 2020, recognizing its contributions to campus-wide scientific research and technical training, per the university's program history. Northwestern has said it does not comment on personnel matters, leaving open how the university will handle Miller's employment status going forward.

Examiners with the Illinois Attorney General's Office examined the electronic devices seized from Miller's home. During the search, specialized K9s named Grip and Enzo assisted authorities in locating additional electronic devices. Those dogs are trained to detect triphenylphosphine oxide, a chemical compound used in electronics for heat dissipation, allowing them to sniff out hidden micro-SD cards, USB drives, and mobile devices that might otherwise go unnoticed.

A Pattern of K9-Assisted Raids Across Lake County

The Lake County Sheriff's Office says its electronic storage detection K9 unit featuring Grip and Enzo has assisted in multiple child exploitation raids across the county in recent years, including arrests in Libertyville in July 2026, Waukegan in May 2026, Antioch in January 2026, and Zion in July 2025. Sheriff John D. Idleburg said in May 2026 that county law enforcement remains committed to aggressively pursuing digital child exploitation cases using specialized K9 resources and cyber task force investigators.

The state has filed to have Miller detained under Illinois's Pretrial Fairness Act, which eliminated cash bail statewide starting in September 2023. Under that law, prosecutors seeking to hold a defendant before trial must file a petition and prove at a hearing within 48 hours that the person poses a specific safety threat or flight risk, according to Illinois Legal Aid Online. Felony sex offenses and child pornography charges are eligible for such detention petitions under the statute.

What Comes Next in the Case

The State's Attorney's Office anticipates additional charges as the investigation continues, per WGN-TV's reporting. Under Illinois statute 720 ILCS 5/11-20.1, possession of child sex abuse material is generally charged as a Class 2 felony carrying three to seven years in prison per count, or a Class 1 felony if moving images or victims under age 13 are involved, according to the Law Offices of Andrew M. Weisberg. A conviction would also trigger mandatory registration under the Illinois Sex Offender Registration Act.

Cases like this one, which local task forces initiate, are sometimes later adopted by federal prosecutors in the Northern District of Illinois under 18 U.S.C. § 2252A when digital file transfers cross state lines through internet servers, since those cases carry mandatory federal sentencing guidelines, per the same legal source. It remains unresolved whether federal authorities will move to join or take over Miller's prosecution, or whether the examination of his seized devices will lead to expanded state charges.