Atty. William Jonathan Nielsen

Atty. William Jonathan Nielsen

William Jonathan Nielsen is a lawyer practicing commercial and residential real estate sales, leasing, acquisitions and financing, estate planning and administration and 1 other area of law. William received a B.A. degree from Lafayette College in 1964, and has been licensed for 58 years.

Great Neck Great Neck 58 yrs experience 58 year
Call (363) 333-2432 Book Appointment

Profile Summary

About William Jonathan Nielsen at a glance

William Jonathan Nielsen is an Of Counsel based in Great Neck, New York. They have 58+ years of legal experience, licensed to practice since 1968. Their practice focuses on residential, estate planning, business, real estate, and m&a. Admitted to practice in New York (1968), U.S. District Court, Eastern District of New York (1974), and U.S. District Court, Southern District of New York (1975). Educated at Fordham University (J.D., 1967) and Lafayette College (B.A., 1964). Recognitions include AV Preeminent. Active member of Director, 1971—, Nassau County, New York State and American Bar Associations Great Neck Lawyers Association. Serands clients in Great Neck, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Jonathan Nielsen is a lawyer practicing commercial and residential real estate sales, leasing, acquisitions and financing, estate planning and administration and 1 other area of law
  • William received a B.A. degree from Lafayette College in 1964, and has been licensed for 58 years
  • William practices in Great Neck, NY

Practice Areas Explained

William Jonathan Nielsen's Areas of Practice

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

Residential Real Estate

William Jonathan Nielsen is one of 9,343 residential attorneys indexed nationally. Browse residential attorneys in New York →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

William Jonathan Nielsen is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning attorneys in New York →

Business & Corporate Law

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

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

Real Estate Law

Real estate attorneys handle home purchases, sales, commercial transactions, title disputes, and landlord-tenant matters.

William Jonathan Nielsen is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in New York →

Mergers & Acquisitions

William Jonathan Nielsen is one of 49,731 m&a attorneys indexed nationally. Browse m&a 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 Great Neck 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 Great Neck or all attorneys in New York.

Frequently Asked

Common questions about William Jonathan Nielsen

Where is William Jonathan Nielsen's law office located?
William Jonathan Nielsen's law practice is located in Great Neck, New York. You can contact the office directly through this profile page.
What practice areas does William Jonathan Nielsen handle?
William Jonathan Nielsen focuses on residential, estate planning, business, real estate, m&a. Each practice area listed reflects experience handling cases of that type in New York.
How long has William Jonathan Nielsen practiced law?
William Jonathan Nielsen has 58+ years of legal experience and has been licensed since 1968.
Where did William Jonathan Nielsen go to law school?
William Jonathan Nielsen earned their education at (J.D., 1967); (B.A., 1964).
How can I contact William Jonathan Nielsen for a consultation?
You can contact William Jonathan Nielsen 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 William Jonathan Nielsen received?
William Jonathan Nielsen's notable recognition includes: AV Preeminent.

Education

J.D.
Fordham University
- 1967
B.A.
Lafayette College
- 1964

Awards

AV Preeminent

Bar Admissions

New York
Admitted: 1968
U.S. District Court, Eastern District of New York
Admitted: 1974
U.S. District Court, Southern District of New York
Admitted: 1975

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