Atty. William David Dalsen

Atty. William David Dalsen

William David Dalsen is a lawyer practicing intellectual property, litigation, patents and 1 other area of law. William received a B.A. degree from Lawrence University in 2005, and has been licensed for 15 years.

New York New York 15 yrs experience 15 year
Call (212) 257-3638 Book Appointment

Profile Summary

About William David Dalsen at a glance

William David Dalsen is an Associate based in New York, New York, practicing at Proskauer Rose Llp. They have 15+ years of legal experience, licensed to practice since 2011. Their practice focuses on patent, ip, and litigation. Admitted to practice in New York (2011) and Massachusetts (2013). Educated at University of Wisconsin Law School (J.D., 2010) and Lawrence University (B.A., 2005). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William David Dalsen is a lawyer practicing intellectual property, litigation, patents and 1 other area of law
  • William received a B.A. degree from Lawrence University in 2005, and has been licensed for 15 years
  • William practices at Proskauer Rose LLP in New York, NY and 1 other location

Practice Areas Explained

William David Dalsen's Areas of Practice

Each practice area below reflects the types of cases William David Dalsen handles, with a brief overview of what that area of law covers.

Patent Law

William David Dalsen is one of 20,749 patent attorneys indexed nationally. Browse patent attorneys in New York →

Intellectual Property

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

William David Dalsen is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in New York →

Civil Litigation

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

William David Dalsen is one of 454,532 litigation attorneys indexed nationally. Browse litigation 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 David Dalsen

Where is William David Dalsen's law office located?
William David Dalsen's law practice is located in New York, New York. The firm is Proskauer Rose Llp. You can contact the office directly through this profile page.
What practice areas does William David Dalsen handle?
William David Dalsen focuses on patent, ip, litigation. Each practice area listed reflects experience handling cases of that type in New York.
How long has William David Dalsen practiced law?
William David Dalsen has 15+ years of legal experience and has been licensed since 2011.
Where did William David Dalsen go to law school?
William David Dalsen earned their education at (J.D., 2010); (B.A., 2005).
How can I contact William David Dalsen for a consultation?
You can contact William David Dalsen 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 Wisconsin Law School
- 2010
B.A.
Lawrence University
- 2005

Bar Admissions

New York
Admitted: 2011
Massachusetts
Admitted: 2013

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