Atty. John B Denniston

Atty. John B Denniston

Mr. John B Denniston is a lawyer practicing contracts, antitrust & trade law, consumer law and 8 other areas of law.

Washington Washington 63 yrs experience 63 year
Call (771) 328-7561 Book Appointment

Profile Summary

About John B Denniston at a glance

John B Denniston is a formation, contracts, employment, breach of contract, and consumer attorney based in Washington, District of Columbia. They have 63+ years of legal experience, licensed to practice since 1963. Admitted to practice in District of Columbia (1963). Educated at Harvard University (J.D., 1962) and Cornell University (Bachelor, 1958). Recognitions include AV Preeminent. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. John B Denniston is a lawyer practicing contracts, antitrust & trade law, consumer law and 8 other areas of law
  • John received a degree from Cornell University in 1958, and has been licensed for 63 years
  • John practices in Washington, DC

Practice Areas Explained

John B Denniston's Areas of Practice

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

Business Formation

John B Denniston is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in District of Columbia →

Contracts

John B Denniston is one of 76,762 contracts attorneys indexed nationally. Browse contracts attorneys in District of Columbia →

Employment Law

Employment lawyers represent workers in wrongful termination, discrimination, harassment, wage & hour disputes, and severance negotiations.

John B Denniston is one of 169,120 employment attorneys indexed nationally. Browse employment attorneys in District of Columbia →

Breach of Contract

John B Denniston is one of 5,938 breach of contract attorneys indexed nationally. Browse breach of contract attorneys in District of Columbia →

Consumer Protection

Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.

John B Denniston is one of 50,607 consumer attorneys indexed nationally. Browse consumer 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 B Denniston

Where is John B Denniston's law office located?
John B Denniston's law practice is located in Washington, District of Columbia. You can contact the office directly through this profile page.
What practice areas does John B Denniston handle?
John B Denniston focuses on formation, contracts, employment, breach of contract, consumer. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has John B Denniston practiced law?
John B Denniston has 63+ years of legal experience and has been licensed since 1963.
Where did John B Denniston go to law school?
John B Denniston earned their education at (J.D., 1962); (Bachelor, 1958).
How can I contact John B Denniston for a consultation?
You can contact John B Denniston 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 B Denniston received?
John B Denniston's notable recognition includes: AV Preeminent.

Education

J.D.
Harvard University
- 1962
Bachelor
Cornell University
- 1958

Awards

AV Preeminent

Bar Admissions

District of Columbia
Admitted: 1963

Reviews

5.0
1 Review
5 0
4 0
3 0
2 0
1 0
These reviews belong to platform users; they do not constitute advertisement or promotion for the attorney. Opinions are published for informational purposes only.

No reviews yet.