Atty. Gregory Michael McMahon

Atty. Gregory Michael McMahon

Gregory Michael McMahon is a lawyer practicing business, class action, toxic tort litigation. Gregory received a B.S. degree from University of Southern California in 1996, and has been licensed for 24 years.

Chicago Chicago 24 yrs experience 24 year
Call (224) 801-3606 Book Appointment

Profile Summary

About Gregory Michael McMahon at a glance

Gregory Michael McMahon is a Shareholder based in Chicago, Illinois, practicing at Segal McCambridge Singer & Mahoney, Ltd.. They have 24+ years of legal experience, licensed to practice since 2002. Their practice focuses on personal injury, business, class action, and litigation. Admitted to practice in Illinois (2002). Educated at DePaul University College of Law (J.D., 2002) and University of Southern California (B.S., 1996). Active member of Chicago, Illinois State and American Bar Associations. Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Gregory Michael McMahon is a lawyer practicing business, class action, toxic tort litigation
  • Gregory received a B.S. degree from University of Southern California in 1996, and has been licensed for 24 years
  • Gregory practices at Segal McCambridge Singer & Mahoney, Ltd. in Chicago, IL

Practice Areas Explained

Gregory Michael McMahon's Areas of Practice

Each practice area below reflects the types of cases Gregory Michael McMahon handles, with a brief overview of what that area of law covers.

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

Gregory Michael McMahon is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Illinois →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Gregory Michael McMahon is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Illinois →

Class Action

Gregory Michael McMahon is one of 26,424 class action attorneys indexed nationally. Browse class action attorneys in Illinois →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Gregory Michael McMahon is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Illinois →

Jurisdictional Context

Why local counsel matters in Illinois

Practicing law in Illinois. Legal matters in Illinois are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Chicago are typically filed in the local municipal court or the appropriate Illinois state district court, depending on subject matter and amount in controversy. An attorney licensed in Illinois brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Illinois courts without local counsel or pro hac vice admission.

Looking for additional Illinois attorneys? Browse all attorneys in Chicago or all attorneys in Illinois.

Frequently Asked

Common questions about Gregory Michael McMahon

Where is Gregory Michael McMahon's law office located?
Gregory Michael McMahon's law practice is located in Chicago, Illinois. The firm is Segal McCambridge Singer & Mahoney, Ltd.. You can contact the office directly through this profile page.
What practice areas does Gregory Michael McMahon handle?
Gregory Michael McMahon focuses on personal injury, business, class action, litigation. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has Gregory Michael McMahon practiced law?
Gregory Michael McMahon has 24+ years of legal experience and has been licensed since 2002.
Where did Gregory Michael McMahon go to law school?
Gregory Michael McMahon earned their education at (J.D., 2002); (B.S., 1996).
How can I contact Gregory Michael McMahon for a consultation?
You can contact Gregory Michael McMahon directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
DePaul University College of Law
- 2002
B.S.
University of Southern California
- 1996

Bar Admissions

Illinois
Admitted: 2002

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