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James Francis Mannion

Litigation Attorney at King of Prussia, PA

1.0   2 reviews
  • Licensed for 33 years
    State PA
    Acquired 1990
    Active No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About James

Learn James’s areas of practice.

Founder and Managing Partner at Mannion Prior, LLP. 


Six attorney firm with a specialized law practice focusing on will contests, trust and estate disputes, fee and commission disputes, guardianship litigation, non-profit/chartible litigation and general fiduciary litigation at the trial and appellate court levels


Partner -  Smith, Aker, Grossman & Hollinger


Senior Associate - Ballard Spahr Andrews & Ingersoll, LLP


Associate - Dilwoth Paxson Kalish & Kauffman



Mannion Prior, LLP
840 First Avenue
Suite 100
King of Prussia, PA, 19406

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1.0 / 5.0
  2 customer reviews
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1 Star
Posted by Susan | April 5, 2020
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Too expensive
I have talked to many lawyers the highest fee they wanted was $6K, nut this attorney wanted $10K. I also had a hard time talking to the lawyer that contacted me through his office S. Ott was his name. He couldn't follow timelines. Not sure who is at fault there. I know I can be emotional and this is a very raw issue for me because I cannot honor my in laws final wishes. All I asked was they take the case on a contingency basis not a pro bono and them and all their wealth still couldn't find it in their hearts and minds to help a 92 year old marine veteran that recently lost his wife of 72 years. It isn't that I don't have a good case, it is that they didn't have the confidence in themselves to gain positive results. Some people live by their wallets, some by their hearts. You choose which this one did.
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Posted by anonymous | March 12, 2014
This lawyer took my retainer, and has not informed me of anything
He is very soft spoken, nice, seemed as though he would be on top of every detail as it arose, but he is a perfect example of a lawyer who should lose his license. I am going to take him to Bar Association. He has done nothing to help me. He does not return calls, inform me of anything, does not send me papers from the court, and I cannot believe that he was recommended by a lawyer that I think is the finest. His secretary screwed up and he only defended her. I gave him all the paperwork to prove fraud and prove that my Ex took money from my kid’s trust accounts. I am still in shock as to what he did-not one thing. I cannot say anything good about him because he screwed up my case by waiting to do something-anything. Do not use this lawyer. You will regret it.
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AVVO RATING 8.2 (Excellent)

Work Experience

  • Managing Partner
  • Mannion Prior, LLP
  • 2001 - Present


  • Villanova University School of Law
  • LL.M - Master of Laws
  • 1993
  • George Washington University National Law Center
  • JD - Juris Doctor
  • 1990
  • Pace University
  • B.B.A
  • 1987


  • American College of Trust and Estate Counsel
  • Fellow
  • N/A
  • Joint State Government Commission Advisory Committee on Decedents' Estate Law
  • Member
  • N/A
  • Pennsylvania Supreme Court Procedural Rules Committee
  • Deputy Counsel
  • N/A
  • Pennsylvania Bar Association
  • Member
  • N/A
  • Philadelphia Bar Association, Probate and Trust Law Section
  • Member
  • N/A
  • Montgomery County Bar Association
  • Member
  • N/A
View all associations

Honors and Awards

  • AV Preeminent Rated
  • Martindale-Hubbell
  • 2017
  • Super Lawyers
  • American Lawyer Media
  • 2004
  • Best Lawyer - Litigation Trust and Estates
  • Best Lawyers in America
  • 2003


  • Judges throughout Pennsylvania.
  • The Presumption of Undue Influence and the Shifting Burden of Proof
  • N/A

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Unknown Attorney | Apr 11
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King of Prussia Litigation Lawyer James Francis Mannion
James Francis Mannion
Litigation Attorney
King of Prussia, PA
Licensed for 33 years