About James P. Cullen

As a member of Marshall Dennehey’s Casualty Department, James focuses his efforts on defending clients in general liability matters, including cases involving products liability, premises liability, and automobile liability. James has successfully defended clients in all aspects of litigation in both state and federal court, including obtaining defense verdicts at the magistrate court level and favorable arbitration rulings before the Allegheny County Arbitration panel. His jury trial experience includes second chair defense counsel in a premises liability case involving a defective stairway and landing in Allegheny County. Additionally, James was an integral member of a litigation team that achieved a Voluntary Stipulated Dismissal on behalf of a product distributor client from national multidistrict litigation (MDL) arising from the manufacture and sale of medical devices. Further, James was a member of a trial team that obtained a defense judgment in a product liability claim involving damages alleged in excess of $30 million.

Before joining Marshall Dennehey, James gained litigation experience at a medium-sized civil defense firm as well as experience representing clients in mass toxic tort matters in Pennsylvania and West Virginia.

James graduated sixth in his class from Capital University Law School in 2018. During law school, he served as both a Staff Member and Associate Board Member of the University's Law Review, where he sharpened his legal research and legal writing skills to prepare for his career after graduation.

James also interned at the Pennsylvania Superior Court for the Honorable Mary Jane Bowes in 2017, where he researched and drafted memorandum opinions while working closely with the Judge’s staff. In 2018, James interned at the Allegheny County District Attorney’s Office where he worked directly with Assistant District Attorneys preparing for trial.

James is licensed to practice law in Pennsylvania and West Virginia and is also an active member of the Allegheny County Bar Association, often volunteering to serve as a judge/juror for high school mock trial competitions. James is also a member of the American Bar Association.

Year joined

2022

Results

Defense Verdict Obtained After Seven-Day Bench Trial

Product Liability
September 18, 2025

We received a defense decision after a seven-day bench trial in a product liability action in which the exposure in the case exceeded $30 million. Our client designs, sells and services engineered equipment for the energy industry, including natural gas compression apparatuses for use in transmission pipeline systems. In 2015, the client sold the plaintiff two reciprocating compressor systems to replace outdated equipment at a station located near Downingtown, PA. The compressor systems were designed to inject oil into the gas stream for piston lubrication.

Summary Judgment Secured in a Neighborhood Dispute Alleging Excess Water Runoff

Property Litigation
June 10, 2024

We obtained summary judgment in the Westmoreland County Court of Common Pleas in favor of our clients in a dispute over alleged excess water runoff. Our clients, a married couple, were sued by their neighbors for claims related to water runoff due to the installation of gutters and downspouts on a shed near the property line. We effectively argued for summary judgment on the plaintiffs’ injunction, trespass, nuisance and negligence claims, demonstrating that the plaintiffs lacked the necessary expert testimony to substantiate their case as required under Pennsylvania law.

Thought Leadership

Grossly Underestimated: Exploring Gross Negligence and Liability Waivers in Pennsylvania Premises Liability Law

Pittsburgh
Premises & Retail Liability
October 1, 2024

Gross Enough? A Dive Into Gross Negligence in Pennsylvania Premises Liability Law

Pittsburgh
Premises & Retail Liability
October 1, 2022
Defense Digest, Vol. 28, No.

 

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Services

Areas of Law

  • Other 4
    • General Liability
    • Automobile Liability
    • Premises and Retail Liability
    • Product Liability

Practice Details

  • Firm Information
    Position
    Associate
    Firm Name
    Marshall Dennehey
  • Representative Cases & Transactions
    Cases
    Significant Representative Matters: Successful defense in $30 million product liability trial. Served as second chair in a high-stakes product liability trial, obtaining a major defense result for our client. Plaintiff's final pre-trial dem
    was $22 million with claimed exposure exceeding $30 million. Plaintiff alleged that compressor systems designed
    sold by our client caused weld debris
    excess lubricating oil to contaminate a natural gas pipeline, leading to multimillion-dollar losses at a power plant. Through material testing
    expert testimony, the defense demonstrated that the weld debris allegations were unfounded
    that Plaintiff's own design, maintenance lapses, equipment failures,
    poor system response were the more likely causes. The Court found Plaintiff failed to meet its burden of proof,
    our client paid nothing despite the significant claimed exposure.
    Published Works: 'Grossly Underestimated: Exploring Gross Negligence
    Liability Waivers in Pennsylvania Premises Liability Law,' PAMIC Pulse, Fall 2024
  • Additional Links

Experience

  • Bar Admission & Memberships
    Admissions
    2018, Pennsylvania
    2018, U.S. District Court Western District of Pennsylvania
    2019, West Virginia
    2019, U.S. District Court Southern District of West Virginia
    2024, U.S. District Court Northern District of West Virginia
    Memberships

    Associations & memberships

    Allegheny County Bar Association
    American Bar Association
    Defense Research Institute

  • Education & Certifications
    Law School
    Capital University Law School
    Class of 2018
    J.D.
    summa cum laude
    Other Education
    Slippery Rock University
    Class of 2015
    B.S.

Contact James P. Cullen

Associate at Marshall Dennehey
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Union Trust Building, 501 Grant Street, Suite 700Pittsburgh, PA 15219U.S.A.

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