Daniel Pariser has 25 years of experience in mass tort, class action, and product liability litigation in federal and state courts at both the trial court and appellate levels. He has a specific focus on representing health care industry clients in complex products liability matters and related litigation. Daniel also represents health care industry clients in antitrust and commercial litigation and internal investigations. He frequently manages teams of lawyers in large litigations spanning multiple jurisdictions. In addition, Daniel represents clients in a variety of complex litigation outside of the health care sector, including in product liability, antitrust litigation and white collar defense matters.


  • Sanofi as national counsel in product liability litigation concerning Zantac. Appointed to defense steering committee in In re Zantac (ranitidine) Prods. Liab. Litig., MDL No. 2924 (S.D. Fla.).
  • Bristol-Myers Squibb and Sanofi as national counsel in product liability litigation concerning Plavix®. Argued and won summary judgment in bellwether MDL case on learned intermediary grounds after obtaining favorable prescribing physician testimony. See In re Plavix Mktng., Sales Prac. and Prods. Liability Litig., MDL No. 2418, 2017 WL 3531684 (D.N.J. 2017).
  • Sanofi as national counsel in product liability litigation concerning thalidomide.
  • Bristol-Myers Squibb in appeal affirming dismissal with prejudice of wrongful death claim under Twombly/Iqbal. Rollins v. Wackenhut Services, Inc., et al. 703 F.3d 122 (D.C. Cir. 2012).
  • Bristol-Myers Squibb and Sanofi on successful motion to dismiss claim by third-party payor seeking reimbursement of prescription drug costs. Employer Teamsters-Local Nos. 175/505 Health and Welfare Trust Fund v.Bristol-Myers Squibb Company et al., 969 F. Supp.2d 463 (S.D.W.Va 2013).
  • GlaxoSmithKline in antitrust litigation alleging that company filed "sham" patent litigation.
  • GlaxoSmithKline in case alleging antitrust violations and breach of contract arising from licensing agreement.
  • Hologic in medical device product liability cases and counseling.
  • Cynosure in purported consumer fraud class action concerning laser device. Argued and prevailed on summary judgment. Plastic Surgery Associates, S.C. v. Cynosure, Inc., 407 F. Supp. 3d 59 (D. Mass. 2019).
  • Pharmaceutical company in state attorney general consumer protection litigation.
  • Pharmaceutical company in multidistrict litigation involving tens of thousands of suits. Managed discovery proceedings nationwide.
  • Senior executive of FORTUNE 500 company in criminal investigation.


State AG-Private Atty Alliances Must Be Put To The Lucia Test
Banking Law360, Benefits Law360, Consumer Protection Law360, Environmental Law360
USA: Law and Practice (chapter)
Life Sciences 2018, Chambers and Partners


The Legal 500 U.S.
Product Liability, Mass Tort and Class Action: Pharmaceuticals and Medical Devices — Defense (2015, 2021–2022)


  • J.D., Harvard Law School, 1998, magna cum laude
  • B.A., University of Pennsylvania, 1994, summa cum laude
  • District of Columbia
  • New York
  • Supreme Court of the United States
  • U.S. Court of Appeals for the District of Columbia Circuit
  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Third Circuit
  • U.S. Court of Appeals for the Fourth Circuit
  • U.S. Court of Appeals for the Fifth Circuit
  • U.S. Court of Appeals for the Ninth Circuit
  • Sustaining Member, Product Liability Advisory Council (PLAC)
  • Member, DRI

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