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Mannion Prior, LLP

About Mannion Prior, LLP

Mannion Prior, LLP was formed in August 2001. Before establishing the firm, James F. Mannion and Karl Prior, collectively, gained over 20 years experience at large, nationally-prominent law firms.

We are Pennsylvania’s premier fiduciary litigation boutique, focusing our practice primarily in the Orphans’ Court Division of the Court of Common Pleas. Our practice areas include will contests, trust and trustee litigation, fee and commission disputes, estate litigation, and guardianship and incapacity proceedings. We also represent clients in complex business disputes and commercial litigation matters in Pennsylvania and federal courts.

Area of practice

Mannion Prior, LLP practices law in the following areas and works with its clients to provide the best possible legal solutions.

  • Estate and Probate Litigation
  • Will Contests
  • Trust Disputes
  • Fee and Commission Litigation
  • Guardianship Incapacitated Person Proceedings
  • Charitable Institution and Non-Profit Litigation
  • Business Litigation.
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Mannion Prior, LLP LOCATIONS


Mannion Prior, LLP Headquarters

840 First Avenue ,
Suite 100
King of Prussia, PA

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