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Sean P. Mahoney Partner

Philadelphia, PA | Direct 215.864.6342Fax 215.789.7577
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Sean Mahoney is a trusted advisor to insurers and commercial clients who is respected for his knowledge, responsiveness, creativity and diligence. He has extensive and successful trial and litigation experience in state and federal courts as well as in numerous private arbitrations involving complex insurance coverage, life insurance, reinsurance, business torts, and commercial contract disputes. 

Sean's insurance practice spans a broad range of complex insurance coverage matters. He routinely evaluates coverage and advises third-party primary and excess liability insurers and has frequently and successfully litigated liability insurance coverage disputes in court and in private arbitration. Sean also frequently advises life insurers with respect to life insurance policies and litigates disputes over life insurance claims. Sean’s diverse insurance coverage practice has also included litigating commercial property insurance coverage issues and transnational reinsurance coverage disputes. 

Sean has also successfully litigated numerous commercial contract disputes both within and without the insurance industry. Within the insurance industry, commercial insurers have frequently called upon him to oversee and litigate disputes involving the collection of premiums, managing general agents, retail agents, insurance producers, and third-party claims administrators. Outside of the insurance industry, Sean has also counseled clients and handled litigation over sale-of-goods and service contracts, surety agreements, and the collection and enforcement of judgments. 

Since Sean is a problem-solver, clients often seek his advice and counseling with respect to insurance coverage and commercial matters outside of the litigation context. He has frequently negotiated favorable resolutions for insurers and other clients involved in disputes with third parties that have avoided costly and protracted litigation.

While in law school, Sean served as an Editor of the Villanova Environmental Law Journal and as a Board Member of the Public Interest Fellowship Program at Villanova Law School. Upon graduation, Sean served as judicial law clerk in the United States Court of Appeals for the Third Circuit before entering private practice in 2004.

Representative Matters

  • Obtained summary judgment in favor of commercial liability insurer in Pennsylvania federal court concluding that lower, $100,000 policy limit for reimbursement of defense costs only, without any indemnity coverage, applied instead of higher, $1 million indemnity limit with unlimited defense cost reimbursement and further obtained judgment against insured for reimbursement of defense costs
  • Obtained a six-figure award from a three-member private arbitration panel for a large commercial insurer in a dispute against an insurance producer over failure to remit commercial liability insurance premiums
  • Successfully tried action in Kentucky for unpaid commercial liability insurance premiums to a six-figure jury verdict representing plaintiff insurer and nearly quadrupled damages award after successful appeal
  • Successfully defended a commercial liability insurer in a federal bench trial against claims that a premium refund was due as a result of alleged mid-term cancellation of liability insurance and achieved ruling of no liability for insurer
  • Secured arbitration award from a three-member AAA arbitration panel in favor of a professional liability insurer finding that insurer had no duty to defend/indemnify attorney in an underlying professional liability action
  • Achieved a favorable settlement in a $20 million reinsurance dispute representing a London-based reinsurer sued by a liability insurer over hundreds of unpaid claims

Recognition & Involvement

Sean has been selected in a survey of his peers as a Pennsylvania “Rising Star” in Insurance Coverage or Business Litigation by Super Lawyers nearly every eligible year since 2007.   

Sean is also an active volunteer in his local church and in the local Swarthmore, Pennsylvania community, where he coaches several youth sports teams and works with other members to organize charitable fund-raising events.



Bar and Court Admissions


New Jersey

U.S. District Court for the District of New Jersey

U.S. District Court for the Eastern District of Pennsylvania

U.S. District Court for the Middle District of Pennsylvania

U.S. District Court for the Western District of Pennsylvania

U.S. Court of Appeals for the Third Circuit


Villanova University School of Law, JD, 2002

University of Notre Dame, BA, 1999



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