Atty. John Charles Koster

Atty. John Charles Koster

John Charles Koster is a lawyer. John received a B.A. degree from University of Notre Dame in 1963, and has been licensed for 57 years.

Sag Harbor Sag Harbor 57 yrs experience 57 year
Call (363) 333-2432 Book Appointment

Profile Summary

About John Charles Koster at a glance

John Charles Koster is an attorney based in Sag Harbor, New York. They have 57+ years of legal experience, licensed to practice since 1969. Admitted to practice in New York (1969). Educated at University of Michigan (J.D., 1968) and University of Notre Dame (B.A., 1963). Recognitions include AV Preeminent. Serands clients in Sag Harbor, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Charles Koster is a lawyer
  • John received a B.A. degree from University of Notre Dame in 1963, and has been licensed for 57 years
  • John practices in Sag Harbor, NY

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 Sag Harbor 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 Sag Harbor or all attorneys in New York.

Frequently Asked

Common questions about John Charles Koster

Where is John Charles Koster's law office located?
John Charles Koster's law practice is located in Sag Harbor, New York. You can contact the office directly through this profile page.
How long has John Charles Koster practiced law?
John Charles Koster has 57+ years of legal experience and has been licensed since 1969.
Where did John Charles Koster go to law school?
John Charles Koster earned their education at (J.D., 1968); (B.A., 1963).
How can I contact John Charles Koster for a consultation?
You can contact John Charles Koster 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 John Charles Koster received?
John Charles Koster's notable recognition includes: AV Preeminent.

Education

J.D.
University of Michigan
- 1968
B.A.
University of Notre Dame
- 1963

Awards

AV Preeminent

Bar Admissions

New York
Admitted: 1969

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