Atty. John B. Brennan

Atty. John B. Brennan

John B. Brennan is a lawyer practicing criminal defense, assault and threat crimes, domestic violence and 29 other areas of law.

Marlton Marlton 37 yrs experience 37 year
Call (267) 930-6896 Book Appointment

Profile Summary

About John B. Brennan at a glance

John B. Brennan is a Member based in Marlton, New Jersey, practicing at Law Office of John B. Brennan. They have 37+ years of legal experience, licensed to practice since 1989. Their practice focuses on dui/dwi, drug crimes, criminal defense, federal crimes, and white collar. Admitted to practice in New Jersey (1989), Pennsylvania (1989), United States District Court for the District of New Jersey (1989), and United States Court of Appeals for the Third Circuit (2022). Educated at Widener University School of Law (J.D., 1989) and The College of New Jersery (B.A., 1985). Recognitions include Peer Reviewed. Serands clients in Marlton, NJ and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John B. Brennan is a lawyer practicing criminal defense, assault and threat crimes, domestic violence and 29 other areas of law
  • John received a B.A. degree from The College of New Jersery in 1985, and has been licensed for 37 years
  • John practices at Law Office of John B. Brennan in Marlton, NJ

Practice Areas Explained

John B. Brennan's Areas of Practice

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

DUI / DWI Defense

Find experienced DUI and DWI defense attorneys near you. Compare verified profiles, read client reviews, and consult about your case for free.

John B. Brennan is one of 29,977 dui/dwi attorneys indexed nationally. Browse dui/dwi attorneys in New Jersey →

Drug Crimes

John B. Brennan is one of 6,966 drug crimes attorneys indexed nationally. Browse drug crimes attorneys in New Jersey →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

John B. Brennan is one of 214,271 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in New Jersey →

Federal Crimes

John B. Brennan is one of 6,773 federal crimes attorneys indexed nationally. Browse federal crimes attorneys in New Jersey →

White Collar Crimes

John B. Brennan is one of 20,025 white collar attorneys indexed nationally. Browse white collar attorneys in New Jersey →

Jurisdictional Context

Why local counsel matters in New Jersey

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

Looking for additional New Jersey attorneys? Browse all attorneys in Marlton or all attorneys in New Jersey.

Frequently Asked

Common questions about John B. Brennan

Where is John B. Brennan's law office located?
John B. Brennan's law practice is located in Marlton, New Jersey. The firm is Law Office of John B. Brennan. You can contact the office directly through this profile page.
What practice areas does John B. Brennan handle?
John B. Brennan focuses on dui/dwi, drug crimes, criminal defense, federal crimes, white collar. Each practice area listed reflects experience handling cases of that type in New Jersey.
How long has John B. Brennan practiced law?
John B. Brennan has 37+ years of legal experience and has been licensed since 1989.
Where did John B. Brennan go to law school?
John B. Brennan earned their education at (J.D., 1989); (B.A., 1985).
How can I contact John B. Brennan for a consultation?
You can contact John B. Brennan 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. Brennan received?
John B. Brennan's notable recognition includes: Peer Reviewed.

Education

J.D.
Widener University School of Law
- 1989
B.A.
The College of New Jersery
- 1985

Awards

Peer Reviewed

Bar Admissions

New Jersey
Admitted: 1989
Pennsylvania
Admitted: 1989
United States District Court for the District of New Jersey
Admitted: 1989
United States Court of Appeals for the Third Circuit
Admitted: 2022

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