Atty. William Brian Monahan

Atty. William Brian Monahan

William Brian Monahan is a lawyer practicing litigation, appellate, m&a litigation and 3 other areas of law. William received a B.S. degree from Cornell University in 1999, and has been licensed for 22 years.

New York New York 22 yrs experience 22 year
Call (866) 398-7118 Book Appointment

Profile Summary

About William Brian Monahan at a glance

William Brian Monahan is a Partner based in New York, New York, practicing at Sullivan And Cromwell Llp. They have 22+ years of legal experience, licensed to practice since 2004. Their practice focuses on business, m&a, securities, litigation, and adr. Admitted to practice in New York (2004). Educated at University of Pennsylvania Law School (J.D., 2003) and Cornell University (B.S., 1999). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Brian Monahan is a lawyer practicing litigation, appellate, m&a litigation and 3 other areas of law
  • William received a B.S. degree from Cornell University in 1999, and has been licensed for 22 years
  • William practices at Sullivan & Cromwell LLP in New York, NY

Practice Areas Explained

William Brian Monahan's Areas of Practice

Each practice area below reflects the types of cases William Brian Monahan 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 Brian Monahan is one of 501,317 business attorneys indexed nationally. Browse business attorneys in New York →

Mergers & Acquisitions

William Brian Monahan is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in New York →

Securities Law

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

Mediation & Arbitration

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

William Brian Monahan is one of 73,906 adr attorneys indexed nationally. Browse adr 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 Brian Monahan

Where is William Brian Monahan's law office located?
William Brian Monahan's law practice is located in New York, New York. The firm is Sullivan And Cromwell Llp. You can contact the office directly through this profile page.
What practice areas does William Brian Monahan handle?
William Brian Monahan focuses on business, m&a, securities, litigation, adr. Each practice area listed reflects experience handling cases of that type in New York.
How long has William Brian Monahan practiced law?
William Brian Monahan has 22+ years of legal experience and has been licensed since 2004.
Where did William Brian Monahan go to law school?
William Brian Monahan earned their education at (J.D., 2003); (B.S., 1999).
How can I contact William Brian Monahan for a consultation?
You can contact William Brian Monahan 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 Pennsylvania Law School
- 2003
B.S.
Cornell University
- 1999

Bar Admissions

New York
Admitted: 2004

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