Overview
For John the devil is in the details. Known for being meticulous and analytical, his clients benefit from his methodical approach to litigation.
An experienced and skilled trial attorney, John is the lead trial counsel of the firm’s Employment Litigation group. John has tried cases in both state and federal court, including several federal jury trials. He represents both private businesses and governmental agencies at trial, mostly defending against claims of employment discrimination and civil rights violations. In addition to trying cases, John has extensive experience in all facets of litigation, from initial intake and discovery through summary judgment. John also has extensive experience in handling litigation with federal and state agencies, including the EEOC, the IDHR, OSHA, and the IDOL. John understands that the proper handling of a case from filing through dismissal or trial is often an arduous and nerve-wracking process for a business. To that end, he works with his clients on their cases from beginning to end, whether that be through trial, summary judgment, or settlement. John understands that in litigation, one size does not fit all, and that the specific facts and needs of his clients will dictate the direction of litigation.
Though John is a skilled litigator, he also counsels clients on liability issues well before they reach a court room. He represents employers and business owners in general employment matters, including discrimination claims, and wage and hour issues.
Having studied biology prior to law school, John has a habit of diving into new discoveries and a passion for learning. This serves his clients well as he comes to understand their industries and the details of their businesses. John entered the legal field knowing his work would impact people. He never fails to consider how each decision and outcome will impact his clients.
John doesn’t shy away from a challenge either. He once had a breach of contract case with a single plaintiff against a large corporation. Going up against a much bigger and better financed firm, John was able to secure a verdict for his client. This taught John the value of perseverance and to never quit the fight, no matter how daunting the odds may seem.
Experience
Membership & Involvement
- Member: Chicago Bar Association
Resources & Insights
Alerts
Speaking Engagements
Published Works
Blog Posts
Education on Demand
The new amendment to the Illinois joint employer rule appears to cast a wide net as to who is considered a joint employer. This allows for the potential to expand wage and hour liability in Illinois to businesses that may not even be aware they are joint employers.
OSHA's promised Emergency Temporary Standard (ETS) requiring employers with one hundred or more employees to ensure their employees are either fully vaccinated or tested for COVID-19 on a weekly basis was published last week.
The guidance for operating businesses during the COVID-19 pandemic continues to evolve. John Hayes discusses the latest guidance, including mask mandates and required vaccinations.
Firm News
- 19 Amundsen Davis Attorneys Ranked in 2026 Legal 500
19 Amundsen Davis Attorneys Ranked in 2026 Legal 500Amundsen Davis is pleased to announce the inclusion of 19 of our attorneys in the 2026 Legal 500 ranking.
- Breakfast Briefing Series: Mental Health at Work- Navigating Accommodation Requests and Employer Obligations
Breakfast Briefing Series: Mental Health at Work- Navigating Accommodation Requests and Employer ObligationsJoin Amundsen Davis Labor & Employment partners John Hayes and Laurie Smigielski as they discuss the legal requirements surrounding mental health accommodations and provide practical guidance for handling these sensitive workplace situations.
- Amundsen Davis's 12th Annual Labor & Employment Fall Seminar
Amundsen Davis's 12th Annual Labor & Employment Fall SeminarJoin Amundsen Davis on Thursday, September 24, for our 12th Annual Labor & Employment Fall Seminar in our Chicago office.
- Seventh Circuit Ruling Curbs BIPA Damages for Illinois Businesses
Seventh Circuit Ruling Curbs BIPA Damages for Illinois BusinessesIn a major win for businesses facing Biometric Information Privacy Act (“BIPA”) claims, the U.S. Court of Appeals for the Seventh Circuit recently held that the 2024 amendment limiting damages applies retroactively to cases pending at the time of enactment. This decision significantly reduces potential exposure by limiting plaintiffs who allege multiple, biometric data collections or disclosures to a single recovery, rather than per-scan statutory damages, even for actions that predate the amendment.
Services
- Class Action
- Employment Advice & Counsel
- Employment Litigation
- Equal Pay Compliance
- Labor & Employment
- Prevailing Wage
- Public Sector
- Staffing Agency, Independent Contractor & Contingent Workforce
- Unfair Competition Counseling & Litigation
- Vaccine Mandates in the Workplace
- Wage & Hour
- Workplace Investigations
Education
Northwestern University School of Law, J.D., cum laude
Kalamazoo College, B.A.
Admissions
- Illinois

