Atty. Thomas Matthew Riordan

Atty. Thomas Matthew Riordan

Thomas Matthew Riordan is a lawyer practicing class actions, mass torts, and aggregated litigation, environmental law and natural resources, products liability and mass torts and 1 other area of law. Thomas received a B.A. degree from University of Iowa, and has been licensed for 31 years.

Newport Beach Newport Beach 31 yrs experience 31 year
Call (949) 850-6786 Book Appointment

Profile Summary

About Thomas Matthew Riordan at a glance

Thomas Matthew Riordan is a Partner based in Newport Beach, California, practicing at O'Melveny & Myers LLP. They have 31+ years of legal experience, licensed to practice since 1995. Their practice focuses on class action, product liability, environmental, and insurance. Admitted to practice in California (1995). Educated at Loyola Marymount University J.D. 1994 Order of the Coif (—) and University of Iowa B.A. summa cum laude University of Iowa B.A. Phi Beta Kappa (—). Serands clients in Newport Beach, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Thomas Matthew Riordan is a lawyer practicing class actions, mass torts, and aggregated litigation, environmental law and natural resources, products liability and mass torts and 1 other area of law
  • Thomas received a B.A. degree from University of Iowa, and has been licensed for 31 years
  • Thomas practices at O'Melveny & Myers LLP in Newport Beach, CA

Practice Areas Explained

Thomas Matthew Riordan's Areas of Practice

Each practice area below reflects the types of cases Thomas Matthew Riordan handles, with a brief overview of what that area of law covers.

Class Action

Thomas Matthew Riordan is one of 26,424 class action attorneys indexed nationally. Browse class action attorneys in California →

Product Liability

Thomas Matthew Riordan is one of 66,193 product liability attorneys indexed nationally. Browse product liability attorneys in California →

Environmental Law

Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.

Thomas Matthew Riordan is one of 56,434 environmental attorneys indexed nationally. Browse environmental attorneys in California →

Insurance Law

Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.

Thomas Matthew Riordan is one of 121,912 insurance attorneys indexed nationally. Browse insurance attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Newport Beach are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California 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 California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in Newport Beach or all attorneys in California.

Frequently Asked

Common questions about Thomas Matthew Riordan

Where is Thomas Matthew Riordan's law office located?
Thomas Matthew Riordan's law practice is located in Newport Beach, California. The firm is O'Melveny & Myers LLP. You can contact the office directly through this profile page.
What practice areas does Thomas Matthew Riordan handle?
Thomas Matthew Riordan focuses on class action, product liability, environmental, insurance. Each practice area listed reflects experience handling cases of that type in California.
How long has Thomas Matthew Riordan practiced law?
Thomas Matthew Riordan has 31+ years of legal experience and has been licensed since 1995.
Where did Thomas Matthew Riordan go to law school?
Thomas Matthew Riordan earned their education at (—); (—).
How can I contact Thomas Matthew Riordan for a consultation?
You can contact Thomas Matthew Riordan 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

Loyola Marymount University J.D. 1994 Order of the Coif
- In Progress
University of Iowa B.A. summa cum laude University of Iowa B.A. Phi Beta Kappa
- In Progress

Bar Admissions

California
Admitted: 1995

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