Mannion Prior

Karl Prior, Co-Founding Partner | Mannion Prior, LLP

Karl Prior

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(610) 265-7800

Mannion Prior, LLP co-founder and partner Karl Prior focuses his practice on Orphans’ Court and fiduciary litigation including will contests, trust disputes, estate litigation, and fee and commission disputes. Karl has litigated every aspect of Power of Attorney disputes including the capacity of a principal to execute a Power of Attorney, abuse of an agent’s authority, revocations of Powers of Attorney, and the existence of an agent under Power of Attorney as a less restrictive alternative to an incapacity proceeding.

Karl has tried numerous matters to jury verdict and bench decision in federal court, the Civil Division of Pennsylvania’s Court of Common Pleas, and in the Orphans’ Court Division of the Court of Common Pleas. Most recently, and over the course of a 15-day trial, Karl successfully defended a triple will contest and domicile dispute. He also has successfully argued in state and federal appellate courts.

Karl has served as a panelist on Orphans’ Court practice and developments at various Pennsylvania Bar Institute seminars and at the Pennsylvania State Trial Court Judges Mid-Annual meeting. Orphans’ Court judges have appointed him as Administrator d.b.n.c.t.a. and as Guardian ad litem, and as such he has pursued claims on behalf of troubled estates and safeguarded the interests of incapacitated persons and minors. He has served as and has lectured on the use of experts in Orphans’ Court matters.


Bar Admissions



Previous Experience

  • Cozen O’Connor, 1995-2001

  • Drinker Biddle & Reath, LLP, 1989-1995