Meet Attorney Jonathan Marx


  • Pennsylvania
  • New Jersey
  • U.S. District Court, Eastern District of Pennsylvania
  • U.S. District Court, Middle District of Pennsylvania
  • U.S. District Court for the District of New Jersey


  • Brooklyn Law School, Brooklyn, New York
  • Juris Doctor
  • Penn State University, State College, Pennsylvania
  • Bachelor of Arts
  • Major: Arts and Sciences
  • Beta Sigma Beta – Member

About Jonathan Marx

Attorney Jonathan D. Marx is a founding partner at KaplunMarx, where his primary focus is helping people injured as a result of an accident. Jon is a lifelong Philadelphia area resident, living in center city and now in Montgomery County, Pennsylvania. Jon attended Penn State University where he completed his undergraduate work and then graduated from Brooklyn Law School. He then obtained his license to practice law in 1986 with bar admission in both Pennsylvania and New Jersey.

Jon has been a Plaintiff’s personal injury lawyer since day one, trying his first case only a few months after passing the bar. Jon has been practicing law for over 35 years, he has tried hundreds of cases, and gotten clients millions of dollars in recovery for their injuries.

His experience and knowledge in handling catastrophic personal injury cases is second to none.

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 – 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 our Montgomery County, Pennsylvania office, he is available to handle catastrophic injury cases throughout Pennsylvania and New Jersey.

Read What Clients Have Said About Jon Marx

Let me start by saying that I would entrust Jon with my mother if she needed a personal injury attorney. That being said, I will be forever grateful that I was referred to KaplunMarx and more specifically to Jon. I very much like to be in control and I realized early on that with Jon, I could let go and be confident that he had my best interests at heart. He earned my trust allowing me to focus on my recovery and returning to my life. The outcome he got for me was more than I had expected and I am so very grateful for both his and this team's efforts.

Kristin Moore

If you need a great lawyer, I would highly recommend Jon! He explained the entire process to me very thoroughly and he was very aggressive in his approach to come out on top. His knowledge and expertise made this all possible. I am very pleased. Thanks again Jon for everything!

Jason Hornibrook

I got familiar with KaplunMarx through online reviews and I am more than happy to contribute to the reviews further. It was a Saturday night when I filled out an online form and requested a consultation. Jon called me a couple of hours after and went through the whole thing with me. I trusted him and I'm glad I did; in less than a year, the case was done and I'm very satisfied with the outcome. I hope I never need to need Jon for personal injury issues, but now I'm confident that Jon is there in case any accident happens.

Afrooz Mosallaeipour

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