Liza M. Walsh

Liza M. Walsh


P: 973.757.1101

F: 973.757.1090

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Best Lawyers Award Badge

This award, published by Best Lawyers in partnership with US News & World Report, is not approved by the Supreme Court of New Jersey. Selection methodology is available.


Practice Areas:
  • Business & Commercial Litigation
  • Class Action Defense
  • Intellectual Property & Trade Secret Litigation


States Admitted to Practice:
  • New Jersey


Courts Admitted to Practice:
  • Supreme Court of the United States
  • Third Circuit Court of Appeals
  • Federal Circuit Court of Appeals
  • District of New Jersey


  • Seton Hall University School of Law (1984)
  • Manhattan College (1981)


  • American Bar Association
  • New Jersey State Bar Association
  • Essex County Bar Association
  • The Federal Circuit Bar Association
  • The Association of the Federal Bar of New Jersey

Liza M. Walsh is a highly sought-after litigator with experience representing some of the country’s largest and most prestigious companies. She focuses her practice on federal and complex commercial litigation, with an emphasis on intellectual property, antitrust and class action defense matters. In her more than 30 years of experience, Liza has defended major pharmaceutical companies in significant patent litigation and acted as liaison counsel to groups of defendants in multi-party litigation. She has more than 150 published decisions and represents clients from a diverse range of industries, including pharmaceuticals, health and title insurance, financial services, life sciences, technology, and other service and product industries. She has also served as an arbitrator in major commercial proceedings, amid a growing demand for more female representation in the field. Liza is also counsel to Senator Torricelli in his capacity as the Special Master in the enforcement of the largest court-ordered environmental cleanup in the country, involving CERCLA, RCRA, and other state and federal regulations and addressing soil, groundwater, and sediment contamination.


Liza has been named to the New Jersey Law Journal “Top Women in Law” and a New Jersey Trial Attorney Honoree for 2016.  She has also been named to “Best Lawyers in America” for Commercial Litigation, Patent Law and ERISA Litigation in 2016, following similar recognition for nine prior consecutive years.  Most recently, she was honored by the Executive Women of New Jersey as one of the 2016 “Women of Achievement.”  NJBIZ also selected Ms. Walsh as “Top 25 Leading Women Entrepreneurs of New Jersey” and “New Jersey’s Best 50 Women in Business.” Other honors and credits include “New Jersey Super Lawyers” for eight years, “New York’s Best Lawyers” and “New York’s Women Leaders in the Law” by New York Magazine. A graduate of Seton Hall University School of Law, she received the school’s Distinguished Graduate Award in 2012.


Before founding Walsh Pizzi O’Reilly Falanga LLP, Liza led the litigation practice that was named “Intellectual Property Litigation Group of the Year” by the New Jersey Law Journal in 2014. At the start of her legal career, she served clerkships for the Hon. Clarkson S. Fisher, Chief Judge of the U.S. District Court for the District of New Jersey, from 1985 to 1986, and for Hon. Charles Harrington, J.S.C. of the New Jersey Superior Court, from 1984 to 1985.  An active community advocate, Liza is a member of the Board of the US-Asia Institute, the New Jersey Ballet, and the District Court Historical Society and serves on the Finance Committee for the Roman Catholic Archdiocese of Newark.  She is a Fellow of the American Bar Association.

Honors & Awards
  • New Jersey Law Journal “Top Women in Law” (2016)
  • New Jersey Trial Attorney Honoree (2016)
  • Top 25 Leading Women Entrepreneurs of New Jersey (2015)
  • Best Lawyers in America (2007-2016)
  • New Jersey Law Journal “Intellectual Property Litigation Group of the Year” (2014)
  • “The Top 50 Women” New Jersey Super Lawyers (2010-2015)
  • New Jersey Super Lawyers (2005-2006, 2008-2016)
  • “New York’s Women Leaders in the Law” as seen in New York Magazine (2014)
  • Seton Hall Law School’s Distinguished Graduate (2012)
  • “New Jersey’s Top Rated Lawyers” as seen in Inside Jersey magazine (2012)
  • “New Jersey’s Best 50 Women in Business,” NJBIZ Magazine
  • “New York’s Best Lawyers,” Commercial Litigation and Intellectual Property Law (2013)
Representative Experience
  • Represented sanofi aventis U.S. LLC in obtaining summary judgment on a complex and large-scale antitrust action focused on the alleged market barriers created by contracting practices.
  • Represented Pfizer Inc. and Takeda in their pursuit of patent infringement damages against Teva Pharmaceutical Industries, Ltd. and Sun Pharmaceutical Industries, Ltd. in which Pfizer and Takeda sought damages resulting from Teva’s and Sun’s “at-risk” launches of generic Protonix® in the United States prior to the 2011 expiration of the patent for pantoprozole.  A settlement was reached in the amount of $2.15 billion after a federal jury in Newark rejected arguments by the companies that the patent covered an obvious variation of earlier patented compounds in the same family as Protonix®.
  • Represented Aetna entities in defending a putative class action that challenges under ERISA, the practices of Aetna’s internal fraud investigations employed to recover overpaid health benefits claims and successfully moved for the dismissal of RICO claims challenging that practice
  • Represented Wyeth Inc. entities in defending putative class actions from direct and indirect purchasers of the pharmaceutical product Effexor XR®, which assert antitrust violations arising from Wyeth’s patents regarding Effexor XR® and related patent litigation with pharmaceutical companies seeking to sell generic versions of the product
  • Represented carriers and serving as liaison counsel to carriers and brokers in defending a putative class action asserting antitrust and RICO claims relating to the practice of paying contingent commissions to brokers in both the District Court of New Jersey and the Court of Appeals for the Third Circuit
  • Represented UBS entities and individual defendants in defending a putative class action brought pursuant to the PSLRA arising out of purchases of certain mortgage-backed assets and successfully moved for the dismissal of the Amended Consolidated Complaint
  • Represented Aetna entities in defending a putative class action challenging the use of certain databases to determine “usual and customary rates” for reimbursing plan members for visits to out-of-network providers
  • Represented sanofi-aventis US entities in state-court class action asserting that certain pharmaceutical companies allegedly reported false and inflated average wholesale prices for certain types of outpatient drugs, related to pending Multi-District Litigation
  • Represented Prudential and individual defendants in defending a putative class action brought pursuant to the PSLRA arising out of a public offering of junior subordinated notes
  • Represented Perdue Farms, Inc. in defending a putative class action asserting consumer fraud allegations relating to Perdue’s labeling and sales of certain of its chicken products
  • Represented a variety of pharmaceutical companies as local counsel in prosecuting or defending patent litigation claims arising under the Hatch-Waxman Act
  • Represented Ideavillage Products in defending a putative class action that asserted claims of consumer fraud, unjust enrichment and the like relating to the advertising, marketing, and sales of the Kinoki Foot Pads products
  • Represented clients in the snack food industry in defending against putative class actions in the District of New Jersey and Eastern District of Pennsylvania based on consumer fraud allegations that the caloric and fat content of certain snack foods were mislabeled
  • Represented life sciences entities and serving as liaison counsel to approximately 100 pharmaceutical, technological, and other life sciences entities in defending claims of patent infringement in both the District of New Jersey and the Court of Appeals for the Federal Circuit
  • Represented Mosaid Technologies in patent litigation regarding circuits on DRAM chips and achieved major victory through, in part, a landmark legal decision on e-discovery
  • Represented Texas Instruments as local counsel in patent and antitrust litigation that resulted in the entry of a jury verdict in excess of $100,000,000 on behalf of the client
  • Represented sanofi-aventis entities in defending qui tam litigation arising out of the False Claims Act
  • Represented directors and officers of a real estate developer in defending claims of consumer fraud and violations of the New Jersey Planned Real Estate Development Full Disclosure Act in connection with the development, offering and sale of certain condominiums
  • Eisai, Inc. v. Sanofi Aventis U.S., LLC; Sanofi U.S. Services, Inc. f/k/a Sanofi-Aventis U.S. Inc., __  3d __ (3rd Cir. 2016)
  • Aventis Pharms., Inc. v. Amino Chems. Ltd., 715 F.3d 1363 (Fed. Cir. 2013)
  • In re N.J. Title Ins. Litig., 683 F.3d 451 (3d Cir. 2012)
  • In re Tropicana Orange Juice Mktg. & Sales Practices Litig., 867 F. Supp. 2d 1341 (J.P.M.L. 2012)
  • In re Lipitor Antitrust Litig., 856 F. Supp. 2d 1355 (J.P.M.L. 2012)
  • In re Ins. Brokerage Antitrust Litig., 282 F.R.D. 92 (D.N.J. 2012)
  • Pieczenik v. Bayer Corp., 474 Fed. Appx. 766 (Fed. Cir. 2012)
  • New Jersey Dental Ass’n v. Metropolitan Life Ins. Co., 424 N.J. Super. 160 (App.Div. 2012)
  • In re Ins. Brokerage Antitrust Litig., 618 F.3d 300 (3d Cir. 2010)
  • In re Ins. Brokerage Antitrust Litig., 374 Fed. App’x 263 (3d Cir. 2010)
  • In re Title Ins. Litig., 2009 U.S. Dist. LEXIS 80582 (D.N.J. Oct. 5, 2009)
  • Devito v. Aetna, Inc., 536 F. Supp. 2d 523 (D.N.J. 2008)
  • Appaloosa Inv., L.P.I. v. J.P. Morgan Sec., Inc., 398 N.J. Super. 52, 939 A.2d 257 (App. Div. 2008)
  • Broadcom Corp. v. Qualcomm Inc., 501 F.3d 297 (3d Cir. 2007)
  • Aventis Pharm., Inc. v. Barr Lab., Inc., 411 F. Supp. 2d 490 (D.N.J. 2006)
  • In re Aventis Pharm., Inc., 372 F. Supp. 2d 430 (D.N.J. 2005)
  • MOSAID Tech. Inc. v. Samsung Elec. Co., 362 F. Supp. 2d 526 (D.N.J. 2004)
  • MOSAID Tech. Inc. v. Samsung Elec. Co., 348 F. Supp. 2d 595 (D.N.J. 2004)
  • Di Giorgio Corp. v. Mendez and Co., 230 F. Supp. 2d 552 (D.N.J. 2002)
  • Bio-Tech. Gen. Corp. v. Duramed Pharm., Inc., 174 F. Supp. 2d 229 (D.N.J. 2001)
  • Biovail Corp. Int’l v. Hoechst Aktiengesellschaft, 49 F. Supp. 2d 750 (D.N.J. 1999)
  • Eli Lilly and Co. v. Roussell Corp., 23 F. Supp. 2d 460 (D.N.J. 1998)
  • Bryant v. N.J. Dept. of Transp., 1 F. Supp. 2d 426 (D.N.J. 1998)
  • Member, Local Patent Rules Advisory Committee, U.S. District Court for the District of New Jersey
  • Member, New Jersey State Bar Association’s Equity Jurisprudence Committee
  • Essex County Representative, New Jersey Bar Association Judicial and Prosecutorial Committee
  • Fellow, American Bar Foundation
  • Trustee, Board of Advisors, Federal Bar of the State of New Jersey
  • Trustee, New Jersey District Court Historical Society
  • Member, Fellows of the American Bar Foundation
  • Member, Finance Committee, Roman Catholic Archdiocese of Newark
  • Member, Vice President Board of Directors of the New Jersey Ballet
  • Chairperson, Outside Compensation Committee; Member, Board of Directors, Bally Total Fitness Corporation (1996-2003)