Dispute resolution
Weil, Gotshal & Manges LLP‘s Diane Sullivan is sought after by clients facing class action and MDL proceedings concerning product liability, including representing GSK in claims alleging that the prescription drug Zantac caused cancer, where she was able to secure a settlement covering most claims in October 2024. Sullivan was also retained by L’Oréal to lead its defense in an MDL where plaintiffs allege its hair relaxer products caused breast and uterine cancers, and is also engaged by Johnson & Johnson and Imerys Talc America in the latter’s Ch. 11 proceedings, tied to claims that J&J’s talc products caused ovarian cancer and mesothelioma. Sullivan is based in the firm’s New York office.
Legal 500 Editorial commentary
Mentions
Dispute resolution
Product liability, mass tort and class action - defense: consumer products (including tobacco)
Dispute resolution
Product liability, mass tort and class action - defense: pharmaceuticals and medical devices
Dispute resolution
Product liability, mass tort and class action - defense: toxic tort
Profile
Position
Partner
Career
Diane Sullivan is a renowned trial attorney, specializing in “first-of-kind,” “bet-the-company,” or otherwise high-profile matters that have garnered extensive media coverage across a range of practice areas and industries. She is routinely retained as lead trial counsel in high-stakes litigations. Diane has successfully tried cases for Fortune 500 companies in complex commercial, mass tort, class action, antitrust, patent, and environmental litigations in jurisdictions around the U.S. She has represented some of the biggest, most recognizable companies across industries, including Johnson & Johnson, Altria, AstraZeneca, Baxter Healthcare Corporation, Campbell Soup Company, ESPN, ExxonMobil, Frontier Communications, General Electric, GlaxoSmithKline, Merck, Philip Morris USA, Procter & Gamble, Repsol, SAC Capital, Sanofi, Toyobo, and Walgreens.
Memberships
New Jersey Bar; New York Bar; DC Bar; admitted to practice before several federal courts.
Education
Fairfield University (BA, 1984); University of Pennsylvania Law School (JD, 1987).
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