Atty. William Obrien

Atty. William Obrien

William Obrien is a lawyer practicing litigation, tax, securities & investment fraud and 1 other area of law. William received a B.A. degree from Columbia University in 1972, and has been licensed for 48 years.

New York New York 48 yrs experience 48 year
Call (917) 672-1523 Book Appointment

Profile Summary

About William Obrien at a glance

William Obrien is a Partner based in New York, New York, practicing at Cooley LLP. They have 48+ years of legal experience, licensed to practice since 1978. Their practice focuses on business, tax, securities, litigation, and consumer. Admitted to practice in New York (1978). Educated at Columbia University (J.D., 1977) and Columbia University (B.A., 1972). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Obrien is a lawyer practicing litigation, tax, securities & investment fraud and 1 other area of law
  • William received a B.A. degree from Columbia University in 1972, and has been licensed for 48 years
  • William practices at Cooley LLP in New York, NY

Practice Areas Explained

William Obrien's Areas of Practice

Each practice area below reflects the types of cases William Obrien 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.

William Obrien is one of 501,317 business attorneys indexed nationally. Browse business attorneys in New York →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

William Obrien is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in New York →

Securities Law

William Obrien is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in New York →

Civil Litigation

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

William Obrien is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in New York →

Consumer Protection

Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.

William Obrien is one of 50,607 consumer attorneys indexed nationally. Browse consumer attorneys in New York →

Jurisdictional Context

Why local counsel matters in New York

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

Looking for additional New York attorneys? Browse all attorneys in New York or all attorneys in New York.

Frequently Asked

Common questions about William Obrien

Where is William Obrien's law office located?
William Obrien's law practice is located in New York, New York. The firm is Cooley LLP. You can contact the office directly through this profile page.
What practice areas does William Obrien handle?
William Obrien focuses on business, tax, securities, litigation, consumer. Each practice area listed reflects experience handling cases of that type in New York.
How long has William Obrien practiced law?
William Obrien has 48+ years of legal experience and has been licensed since 1978.
Where did William Obrien go to law school?
William Obrien earned their education at (J.D., 1977); (B.A., 1972).
How can I contact William Obrien for a consultation?
You can contact William Obrien 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.
Columbia University
- 1977
B.A.
Columbia University
- 1972

Bar Admissions

New York
Admitted: 1978

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