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Thomas S. Biemer

Partner; Chair, Litigation Department
Primary Office
1500 Market St., Suite 3500E
Philadelphia, PA 19102
Direct(215) 575-7025
Fax(215) 575-7200


Veronica McKeage
Direct(215) 575-7141

As Chair of Dilworth Paxson’s Litigation Department, Thomas S. Biemer has spent his entire 30 year career at Dilworth Paxson. He is responsible for over 50 attorneys in five offices practicing in state and federal courts in numerous jurisdictions.

He represents his clients in complex commercial cases, handling matters in state and federal courts involving RICO, corporate governance, construction, ERISA, CERCLA, commercial real estate, patents, healthcare, class actions, trusts and estates, and contract disputes. He also represents both plaintiffs and defendants in a variety of alternative forums designed to expedite resolution and minimalize costs. Further, he has served as lead counsel with respect to numerous high profile investigations – including acting as lead counsel with respect to six special litigation committees investigating alleged breach of fiduciary duty arising out of corporate transactions.

Licensed in Pennsylvania and New Jersey, Mr. Biemer is also admitted in the State Courts of Pennsylvania, State Courts of New Jersey, United States Supreme Court, U.S. Court of Appeals for the Second Circuit, United States Court of Appeals for the Third Circuit, United States Court of Appeals for the Fourth Circuit, United States Court of Appeals for the Federal Circuit, United States District Court for the Eastern District of Pennsylvania, United States District Court for the District of New Jersey, United States District Court for the Southern District of New York, and the United States Tax Court.

Representative Experience

  • Represented a medical device company in Delaware Chancery Court.  Successfully negotiated an eight figure settlement.
  • Represented areas largest children’s hospital in trade-secret dispute arising out of commercialization of genetic markers for Parkinson’s disease.  Successfully terminated litigation after recovery of all protected information.
  • Represented a technology company in multi-patent litigation against major cell phone manufacturers involving network connectivity and Local Area Networks.
  • Represented a national bank in trust matter regarding the retention of a closely-held business in a family trust.   Damages were in excess of $2 billion. Defense verdict obtained in Orphans’ Court and affirmed on appeal after a 15-day bench trial.
  • Represented a Pennsylvania corporation as lead trial counsel in a 4-week bench trial arising out of a sale of substantially all of the company’s assets.
  • Represented an investment advisor in defamation action brought by a publicly-traded company. Damages were in excess of $90 million. Defense verdict obtained after a 5-week jury trial.
  • Represented Town of Margate, New Jersey with respect to dune replenishment.  Obtained initial injunction before matter resolved.
  • Represented multi-billion foreign corporation in a matter involving trade disparagement.  Successfully survived SLAPP challenge in California court.
  • Represented six separate Special Litigation Committees as lead counsel in litigation arising out of the sale of publicly-traded companies in transactions ranging from $1-7 billion.
  • Represented a regional rail authority in dispute involving claims for design defects arising out of the reconstruction of an elevated rail structure. Claims exceeded $50 million and involved complex issues of construction management and structural design.
  • Represented multiple transportation authorities in CERCLA action seeking contribution recovery concerning PCBs at the Paoli Rail Yard. Settled case on behalf of clients. Settlement was one of the ten largest commercial cases in the Commonwealth that year.
  • Represented a document solution company against claims of patent infringement relating to the centralized collection of geographically distributed clinical information in the pharmaceutical industry. Award of non-infringement in binding arbitration from the American Arbitration Association.
  • Represented a software company in a matter that involved the patentability of business methods, resulting in an extension of patent protection to industries and technologies not previously covered.
  • Represented 53 area hospitals and other medical care providers in a litigation matter and recovered over $40 million on the providers' behalf. This was the first insolvency of a major HMO in America.
  • Represented financial associations challenging lead ordinances attempting to regulate subprime lending market in Philadelphia. Represented on a national level against similar challenges in Ohio, Georgia, and California. Also successfully guided clients, AFSA, and Maryland mortgage brokers to obtaining a permanent injunction to prevent the enforcement of a Montgomery County, Maryland lending bill.
  • Represented a large, regional healthcare insurer in a series of class actions brought by members and beneficiaries of ERISA plans. The class action claims involved the calculation of the family deductible, the negotiation of discounts regarding co-insurance, coverage for Viagra, subrogation rights, and Medicare supplemental benefits.
  • Represented plaintiffs in the squeeze-out of a minority shareholder involving one of the largest closely-held corporations in the Northeast. Successfully obtained a nine-figure settlement.
  • Represented multi-national corporation in multiple domain name disputes under the ICANN Uniform Domain-Name Dispute Resolution Policy involving the enforcement of the client’s brand name against domestic and international cyber-squatters. All matters resulted in ruling for client.
  • Represented amicus curiae in case before the United States Court of Appeals for the Federal Circuit. This matter involved the shifting of the burden of proof for willfulness in a patent infringement case. The brief of amicus was cited by Judge Dyk in his dissent, which has been referenced in many recent legal publications involving the issue of willfulness in patent infringement cases.
  • Represented amici curiae in case before the United States Court of Appeals for the Federal Circuit. This matter involves issues relating to the duty to exercise due care when an alleged infringer is placed on notice of a patent owner’s rights.
  • Represented a large national contractor in bid protest of $750 million contract with the Commonwealth of Pennsylvania.

Professional & Community Activities

  • General Counsel and Board of Directors, Urban League of Philadelphia, 2009–2017
  • Instructor, University of Texas, Constitutional Law and Government, 1991
  • Captain, U.S. Army Air Defense, 1984–1992 (Platoon Leader and Battery Executive Officer for a Patriot Missile Air Defense Battery)

Speeches & Presentations

  • Served as mediator in complex intellectual property and contract disputes.
  • Presentation at Patent Law Symposium.
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Alternate Biographies





  • J.D., with high honors, The University of Texas School of Law, Associate Editor of University of Texas Law Review, 1991
  • B.A., cum laude, Bucknell University, 1984

Bar Admissions

  • Pennsylvania, 1991
  • New Jersey, 1995
  • United States Supreme Court, 1998
  • United States Court of Appeals Second Circuit, 2009
  • United States Court of Appeals Third Circuit, 2000
  • United States Court of Appeals Fourth Circuit, 2002
  • United States Court of Appeals Federal Circuit, 1996
  • United States District Court Eastern District of Pennsylvania, 1992
  • United States District Court District of New Jersey, 1996
  • United States District Court Southern District of New York, 2004
  • United States Tax Court, 2008