• Pennsylvania
  • Supreme Court of the United States
  • United States Court of Appeals for the Third Circuit
  • U.S. District Court - Eastern District of Pennsylvania
  • United States Court of Federal Claims


  • Brehon Law Society
  • Lawyers' Club of Philadelphia
  • North Hills Country Club
  • Philadelphia Bar Association
  • St. Joseph's Law Alumni Association


  • Villanova University School of Law, JD
  • St. Joseph's University, BA
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Denis J. Lawler

Of Counsel

Philadelphia, PA v. +1.215.569.5550 f. +1.215.832.5550

Denis Lawler has spent his entire career trying cases.  Most recently, those matters have involved:

  • the defense in arbitration of a supplier who had terminated a long-term supply contract on the grounds of impossibility, resulting in a defense verdict and the award of $1,000,000 in attorneys’ fees under a fee-shifting provision in the contract involved;
  • the defense of a seller of a business against claims of breach of warranties and representations in the sale; the liability phase had been lost by predecessor counsel; in the trial of the damages phase, plaintiff’s $30,000,000 claim based on an economist’s report was thrown out, resulting in a minimal award, which in turn led to a filing by the plaintiffs of new actions in federal court under RICO; and most recently,
  • the defense of corporate fiduciaries in trust matters before Pennsylvania Orphans’ Courts.

Mr. Lawler has received the highest possible rating from Martindale-Hubbell.


  • Estates and orphans' court litigation involving the representations of foreign claimants to Pennsylvania estates, will contests, disputes involving powers of attorney, and disputes involving nonprofit corporations.
  • Contract matters involving representation of guarantors, builders, developers, landlords, mortgagees, and land owners in various disputes including construction and zoning matters.
  • Legal professional liability matters involving disputes between law partners, recovery of funds from embezzling attorneys, and defense of malpractice claims.
  • Government contracts involving various disputes in the Court of Federal Claims challenging government actions involving acquisition of goods and services.
  • First jury trial: the defense of first-degree murder charge, one year out of law school, with his father at counsel table, resulting in a voluntary manslaughter verdict. 


Mr. Lawler is a Fellow of the  American College of Trial Lawyers.  Mr. Lawler was also recently appointed to the board of directors of the Court Appointed Special Advocates of Philadelphia County.  He also serves as a board member and past president of The Lawyers' Club of Philadelphia and St. Joseph's University Law Alumni.  He is a member of the Brehon Law Society and North Hills Country Club, where he served on the board and as president.  Mr. Lawler also serves as a member of La Salle College High School's Board of Trustees (2009-2014); currently, he is chair of its Governance and Leadership Committee.