Atty. Marc de Leeuw

Atty. Marc de Leeuw

Marc de Leeuw is a lawyer practicing antitrust, appellate, arbitration and 3 other areas of law. Marc received a B.S. degree from University of Rochester in 1989, and has been licensed for 34 years.

New York New York 34 yrs experience 34 year
Call (516) 689-0094 Book Appointment

Profile Summary

About Marc de Leeuw at a glance

Marc de Leeuw is a Partner based in New York, New York, practicing at Sullivan And Cromwell Llp. They have 34+ years of legal experience, licensed to practice since 1992. Their practice focuses on ip, securities, litigation, adr, and appellate. Admitted to practice in New Jersey (1992) and New York (1993). Educated at Columbia Law School (J.D., 1992) and University of Rochester (B.S., 1989). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Marc de Leeuw is a lawyer practicing antitrust, appellate, arbitration and 3 other areas of law
  • Marc received a B.S. degree from University of Rochester in 1989, and has been licensed for 34 years
  • Marc practices at Sullivan & Cromwell LLP in New York, NY

Practice Areas Explained

Marc de Leeuw's Areas of Practice

Each practice area below reflects the types of cases Marc de Leeuw handles, with a brief overview of what that area of law covers.

Intellectual Property

IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.

Marc de Leeuw is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in New York →

Securities Law

Marc de Leeuw 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.

Marc de Leeuw 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.

Marc de Leeuw is one of 73,906 adr attorneys indexed nationally. Browse adr attorneys in New York →

Appellate Practice

Appellate attorneys for civil and criminal appeals at state and federal court.

Marc de Leeuw is one of 86,319 appellate attorneys indexed nationally. Browse appellate 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 Marc de Leeuw

Where is Marc de Leeuw's law office located?
Marc de Leeuw'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 Marc de Leeuw handle?
Marc de Leeuw focuses on ip, securities, litigation, adr, appellate. Each practice area listed reflects experience handling cases of that type in New York.
How long has Marc de Leeuw practiced law?
Marc de Leeuw has 34+ years of legal experience and has been licensed since 1992.
Where did Marc de Leeuw go to law school?
Marc de Leeuw earned their education at (J.D., 1992); (B.S., 1989).
How can I contact Marc de Leeuw for a consultation?
You can contact Marc de Leeuw 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 Law School
- 1992
B.S.
University of Rochester
- 1989

Bar Admissions

New Jersey
Admitted: 1992
New York
Admitted: 1993

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