Atty. John Anthony Detzner

Atty. John Anthony Detzner

John Anthony Detzner is a lawyer practicing export controls, economic sanctions, foreign corrupt practices act and 3 other areas of law. John received a A.B. degree from Harvard University in 1977, and has been licensed for 46 years.

Washington Washington 46 yrs experience 46 year
Call (771) 232-9635 Book Appointment

Profile Summary

About John Anthony Detzner at a glance

John Anthony Detzner is an Of Counsel based in Washington, District of Columbia, practicing at Neville Peterson LLP. They have 46+ years of legal experience, licensed to practice since 1980. Their practice focuses on business and international. Admitted to practice in Illinois (1980), U.S. District Court, Northern District of Illinois (1980), District of Columbia (1989), and U.S. District Court for the District of Columbia, U.S. Court of International Trade, U.S. Court of A (1990). Educated at Harvard Law School (J.D., 1980) and Harvard University (A.B., 1977). Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Anthony Detzner is a lawyer practicing export controls, economic sanctions, foreign corrupt practices act and 3 other areas of law
  • John received a A.B. degree from Harvard University in 1977, and has been licensed for 46 years
  • John practices at Neville Peterson LLP in Washington, DC

Practice Areas Explained

John Anthony Detzner's Areas of Practice

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

Business & Corporate Law

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

John Anthony Detzner is one of 501,317 business attorneys indexed nationally. Browse business attorneys in District of Columbia →

International Law

International law attorneys for cross-border transactions, trade, foreign investment, and treaties.

John Anthony Detzner is one of 40,133 international attorneys indexed nationally. Browse international attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia 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 District of Columbia courts without local counsel or pro hac vice admission.

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about John Anthony Detzner

Where is John Anthony Detzner's law office located?
John Anthony Detzner's law practice is located in Washington, District of Columbia. The firm is Neville Peterson LLP. You can contact the office directly through this profile page.
What practice areas does John Anthony Detzner handle?
John Anthony Detzner focuses on business, international. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has John Anthony Detzner practiced law?
John Anthony Detzner has 46+ years of legal experience and has been licensed since 1980.
Where did John Anthony Detzner go to law school?
John Anthony Detzner earned their education at (J.D., 1980); (A.B., 1977).
How can I contact John Anthony Detzner for a consultation?
You can contact John Anthony Detzner 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.
Harvard Law School
- 1980
A.B.
Harvard University
- 1977

Bar Admissions

Illinois
Admitted: 1980
U.S. District Court, Northern District of Illinois
Admitted: 1980
District of Columbia
Admitted: 1989
U.S. District Court for the District of Columbia, U.S. Court of International Trade, U.S. Court of A
Admitted: 1990
U.S. Supreme Court and U.S. Court of Federal Claims
Admitted: 1993

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