Atty. Duncan Thomas O'Brien

Atty. Duncan Thomas O'Brien

Duncan Thomas O'Brien is a lawyer practicing business law, securitizations, financings and 1 other area of law. Duncan Thomas received a B.A. degree from Harvard University in 1982, and has been licensed for 39 years.

Boston Boston 39 yrs experience 39 year
Call (857) 702-2964 Book Appointment

Profile Summary

About Duncan Thomas O'Brien at a glance

Duncan Thomas O'Brien is a Partner based in Boston, Massachusetts, practicing at Sullivan & Worcester LLP. They have 39+ years of legal experience, licensed to practice since 1987. Their practice focuses on business. Admitted to practice in New York (1987) and Massachusetts U.S. Court of Appeals, Eleventh Circuit (1998). Educated at Harvard Law School (J.D., 1985) and Harvard University (B.A., 1982). Recognitions include AV Preeminent. Active member of The Association of the Bar of the City of New York Boston Bar Association. Serands clients in Boston, MA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Duncan Thomas O'Brien is a lawyer practicing business law, securitizations, financings and 1 other area of law
  • Duncan Thomas received a B.A. degree from Harvard University in 1982, and has been licensed for 39 years
  • Duncan Thomas practices at Sullivan & Worcester LLP in Boston, MA

Practice Areas Explained

Duncan Thomas O'Brien's Areas of Practice

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

Business & Corporate Law

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

Duncan Thomas O'Brien is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Massachusetts →

Jurisdictional Context

Why local counsel matters in Massachusetts

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

Looking for additional Massachusetts attorneys? Browse all attorneys in Boston or all attorneys in Massachusetts.

Frequently Asked

Common questions about Duncan Thomas O'Brien

Where is Duncan Thomas O'Brien's law office located?
Duncan Thomas O'Brien's law practice is located in Boston, Massachusetts. The firm is Sullivan & Worcester LLP. You can contact the office directly through this profile page.
What practice areas does Duncan Thomas O'Brien handle?
Duncan Thomas O'Brien focuses on business. Each practice area listed reflects experience handling cases of that type in Massachusetts.
How long has Duncan Thomas O'Brien practiced law?
Duncan Thomas O'Brien has 39+ years of legal experience and has been licensed since 1987.
Where did Duncan Thomas O'Brien go to law school?
Duncan Thomas O'Brien earned their education at (J.D., 1985); (B.A., 1982).
How can I contact Duncan Thomas O'Brien for a consultation?
You can contact Duncan 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.
What awards or recognition has Duncan Thomas O'Brien received?
Duncan Thomas O'Brien's notable recognition includes: AV Preeminent.

Education

J.D.
Harvard Law School
- 1985
B.A.
Harvard University
- 1982

Awards

AV Preeminent

Bar Admissions

New York
Admitted: 1987
Massachusetts U.S. Court of Appeals, Eleventh Circuit
Admitted: 1998

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