Atty. John William Dehaan

Atty. John William Dehaan

John William Dehaan is a lawyer practicing mediation, litigation, appeals and 1 other area of law. John has been licensed for 31 years.

Hauppauge Hauppauge 31 yrs experience 31 year
Call (631) 450-6197 Book Appointment

Profile Summary

About John William Dehaan at a glance

John William Dehaan is a Partner based in Hauppauge, New York, practicing at The DeHaan Law Firm P.C.. They have 31+ years of legal experience, licensed to practice since 1995. Their practice focuses on litigation, insurance, adr, and appellate. Admitted to practice in New York (1995). Educated at New York Law School (J.D., 1994). Serands clients in Hauppauge, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John William Dehaan is a lawyer practicing mediation, litigation, appeals and 1 other area of law
  • John has been licensed for 31 years
  • John practices at The DeHaan Law Firm P.C. in Hauppauge, NY

Practice Areas Explained

John William Dehaan's Areas of Practice

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

Civil Litigation

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

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

Insurance Law

Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.

John William Dehaan is one of 121,912 insurance attorneys indexed nationally. Browse insurance attorneys in New York →

Mediation & Arbitration

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

John William Dehaan 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.

John William Dehaan 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 Hauppauge 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 Hauppauge or all attorneys in New York.

Frequently Asked

Common questions about John William Dehaan

Where is John William Dehaan's law office located?
John William Dehaan's law practice is located in Hauppauge, New York. The firm is The DeHaan Law Firm P.C.. You can contact the office directly through this profile page.
What practice areas does John William Dehaan handle?
John William Dehaan focuses on litigation, insurance, adr, appellate. Each practice area listed reflects experience handling cases of that type in New York.
How long has John William Dehaan practiced law?
John William Dehaan has 31+ years of legal experience and has been licensed since 1995.
Where did John William Dehaan go to law school?
John William Dehaan earned their education at (J.D., 1994).
How can I contact John William Dehaan for a consultation?
You can contact John William Dehaan 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.
New York Law School
- 1994

Bar Admissions

New York
Admitted: 1995

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