Atty. Thomas P. O'Brien
Thomas P. O'Brien is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar and Litigation - Securities.
Profile Summary
About Thomas P. O'Brien at a glance
Thomas P. O'Brien is a criminal defense, white collar, and litigation attorney based in Los Angeles, California, practicing at Greenberg Traurig. Educated at University of San Diego (J.D., 1993). Recognitions include Best Lawyers in America — Criminal Defense: White-Collar (2026) and Best Lawyers in America — Litigation - Securities (2026). Serands clients in Los Angeles, CA and the surrounding metropolitan area.
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About
- Thomas P. O'Brien is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar and Litigation - Securities
- Thomas P., who practices law in Los Angeles, California, has been recognized since 2016
- This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Thomas P. is held by other top lawyers in the same geographic and legal practice area
Practice Areas Explained
Thomas P. O'Brien's Areas of Practice
Each practice area below reflects the types of cases Thomas P. O'Brien handles, with a brief overview of what that area of law covers.
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Thomas P. O'Brien is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in California →
Thomas P. O'Brien is one of 20,025 white collar attorneys indexed nationally. Browse white collar attorneys in California →
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Thomas P. O'Brien is one of 454,532 litigation attorneys indexed nationally. Browse litigation 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 Los Angeles 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 Los Angeles or all attorneys in California.
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