Atty. Jonathan David Marx

Atty. Jonathan David Marx

Attorney Jonathan D. Marx is a founding partner at KaplunMarx, where his primary focus is on personal injury and criminal defense.

Philadelphia Philadelphia 40 J. Erfahrung 40 year
Call (484) 361-9287 Book Appointment

Profile Summary

About Jonathan David Marx at a glance

Jonathan David Marx is a Partner based in Philadelphia, Pennsylvania, practforg at KaplunMarx Accident & Injury Lawyers. They have 40+ years of legal experience, licensed to practice since 1986. Their practice focuses on car accidents, truck accidents, medical malpractice, wrongful death, and personal injury. Admitted to practice in Pennsylvania U.S. District Court, Eastern District of Pennsylvania New Jersey United States District (1986). Educated at Brooklyn Law School (J.D., 1986) and Pennsylvania State University (B.A., 1983). Recognitions include Peer Reviewed. Serands clients in Philadelphia, PA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

Über uns

  • Attorney Jonathan D. Marx is a founding partner at KaplunMarx, where his primary focus is on personal injury and criminal defense
  • Attorney Marx has been practicing law for over 30 years, and is the consummate trial lawyer
  • Jon has represented thousands of clients, in hundreds of court rooms, always focusing his efforts on getting top notch results for clients no matter the circumstances
  • Jon has been voted a Top 100 Trial Lawyer by the American Society of Legal Advocates, and achieved a perfect 10.0 rating on legal ranking site avvo.com – but he is most proud of the great reviews he has received from his clients
  • These reviews and results speak volumes to his qualities as a trial lawyer
  • While Jon is based in Bala Cynwyd, PA, he handles cases throughout Pennsylvania and New Jersey

Practice Areas Explained

Jonathan David Marx's Areas of Practice

Each practice area below reflects the types of cases Jonathan David Marx handles, with a brief overview of what that area of law covers.

Car Accidents

Hurt in a car crash? Car accident lawyers fight insurance companies for fair compensation — free consult, no fee unless you win.

Jonathan David Marx is one of 36,807 car accidents attorneys indexed nationally. Browse car accidents attorneys in Pennsylvania →

Truck Accidents

Jonathan David Marx is one of 4,975 truck accidents attorneys indexed nationally. Browse truck accidents attorneys in Pennsylvania →

Medical Malpractice

Medical malpractice lawyers represent patients harmed by negligent doctors, hospitals, and other providers. Free case review, no fee unless you win.

Jonathan David Marx is one of 49,086 medical malpractice attorneys indexed nationally. Browse medical malpractice attorneys in Pennsylvania →

Wrongful Death

Jonathan David Marx is one of 31,253 wrongful death attorneys indexed nationally. Browse wrongful death attorneys in Pennsylvania →

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

Jonathan David Marx is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Pennsylvania →

Jurisdictional Context

Why local counsel matters in Pennsylvania

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

Looking for additional Pennsylvania attorneys? Browse all attorneys in Philadelphia or all attorneys in Pennsylvania.

Frequently Asked

Common questions about Jonathan David Marx

Where is Jonathan David Marx's law office located?
Jonathan David Marx's law practice is located in Philadelphia, Pennsylvania. The firm is KaplunMarx Accident & Injury Lawyers. You can contact the office directly through this profile page.
What practice areas does Jonathan David Marx handle?
Jonathan David Marx focuses on car accidents, truck accidents, medical malpractice, wrongful death, personal injury. Each practice area listed reflects experience handling cases of that type in Pennsylvania.
How long has Jonathan David Marx practiced law?
Jonathan David Marx has 40+ years of legal experience and has been licensed since 1986.
Where did Jonathan David Marx go to law school?
Jonathan David Marx earned their education at (J.D., 1986); (B.A., 1983).
How can I contact Jonathan David Marx for a consultation?
You can contact Jonathan David Marx 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 Jonathan David Marx received?
Jonathan David Marx's notable recognition includes: Peer Reviewed.

Education

J.D.
Brooklyn Law School
- 1986
B.A.
Pennsylvania State University
- 1983

Awards

Peer Reviewed

Bar Admissions

Pennsylvania U.S. District Court, Eastern District of Pennsylvania New Jersey United States District
Admitted: 1986

Bewertungen

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