Atty. Mark Thomas O'Brien

Atty. Mark Thomas O'Brien

Mark Thomas O'Brien is a lawyer practicing alternative dispute resolution, appellate practice, automobile accidents and injuries and 5 other areas of law. Mark received a B.A. degree from University of Maryland in 1976, and has been licensed for 41 years.

Hyattsville Hyattsville 41 J. Erfahrung 41 year
Call (301) 968-6019 Book Appointment

Profile Summary

About Mark Thomas O'Brien at a glance

Mark Thomas O'Brien is an Assoc. Dist. J. based in Hyattsville, Maryland. They have 41+ years of legal experience, licensed to practice since 1985. Their practice focuses on car accidents, personal injury, criminal defense, litigation, and adr. Admitted to practice in Maryland (1985), District of Columbia (1988), U.S. District Court, District of Maryland (1991), and U.S. Court of Appeals for the Armed Forces (1996). Educated at University of Baltimore School of Law (J.D., 1984) and University of Maryland (B.A., 1976). Serands clients in Hyattsville, MD and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

Über uns

  • Mark Thomas O'Brien is a lawyer practicing alternative dispute resolution, appellate practice, automobile accidents and injuries and 5 other areas of law
  • Mark received a B.A. degree from University of Maryland in 1976, and has been licensed for 41 years
  • Mark practices in Hyattsville, MD

Practice Areas Explained

Mark Thomas O'Brien's Areas of Practice

Each practice area below reflects the types of cases Mark Thomas O'Brien handles, with a brief overview of what that area of law covers.

Car Accidents

Hurt in a car crash? Car accident lawyers fight insurance companies for fair compensation — free consult, no fee unless you win.

Mark Thomas O'Brien is one of 36,807 car accidents attorneys indexed nationally. Browse car accidents attorneys in Maryland →

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.

Mark Thomas O'Brien is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Maryland →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

Mark Thomas O'Brien is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Maryland →

Civil Litigation

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

Mark Thomas O'Brien is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Maryland →

Mediation & Arbitration

Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.

Mark Thomas O'Brien is one of 73,906 adr attorneys indexed nationally. Browse adr attorneys in Maryland →

Jurisdictional Context

Why local counsel matters in Maryland

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

Looking for additional Maryland attorneys? Browse all attorneys in Hyattsville or all attorneys in Maryland.

Frequently Asked

Common questions about Mark Thomas O'Brien

Where is Mark Thomas O'Brien's law office located?
Mark Thomas O'Brien's law practice is located in Hyattsville, Maryland. You can contact the office directly through this profile page.
What practice areas does Mark Thomas O'Brien handle?
Mark Thomas O'Brien focuses on car accidents, personal injury, criminal defense, litigation, adr. Each practice area listed reflects experience handling cases of that type in Maryland.
How long has Mark Thomas O'Brien practiced law?
Mark Thomas O'Brien has 41+ years of legal experience and has been licensed since 1985.
Where did Mark Thomas O'Brien go to law school?
Mark Thomas O'Brien earned their education at (J.D., 1984); (B.A., 1976).
How can I contact Mark Thomas O'Brien for a consultation?
You can contact Mark Thomas O'Brien 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.
University of Baltimore School of Law
- 1984
B.A.
University of Maryland
- 1976

Bar Admissions

Maryland
Admitted: 1985
District of Columbia
Admitted: 1988
U.S. District Court, District of Maryland
Admitted: 1991
U.S. Court of Appeals for the Armed Forces
Admitted: 1996

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