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Diane P Sullivan
Lawyers profile
USA 2024
Lawyers profile | USA 2024: Litigation: Trial Lawyers, Product Liability & Mass Torts, Litigation: General Commercial, Litigation: Product Liability
Diane P Sullivan
Ranked in 4 Practice Areas

Star Individuals

Litigation: Trial Lawyers

USA - Nationwide

11 Years Ranked

1

Band 1

Product Liability & Mass Torts

USA - Nationwide

15 Years Ranked

1

Band 1

Litigation: General Commercial

New Jersey

13 Years Ranked

1

Band 1

Litigation: Product Liability

New Jersey

5 Years Ranked

Ranked in Guides
Global 2025

About

Provided by Diane P Sullivan

USA

Practice Areas

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.

Professional Memberships

New Jersey Bar; New York Bar; DC Bar; admitted to practice before several federal courts.

Personal

Fairfield University (BA, 1984); University of Pennsylvania Law School (JD, 1987).

Chambers Review

Provided by Chambers

USA

Litigation: Trial Lawyers - USA - Nationwide

Star Individuals
Individual Editorial
Diane Sullivan is renowned for her trial work, with particular expertise defending large medical device and pharmaceutical companies in major product liability trials, including high-stakes mass torts. She is based in the New York office at Weil.
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Litigation: General Commercial - New Jersey

1
Band 1
Individual Editorial
Diane Sullivan of Weil, Gotshal & Manges comes highly recommended for her handling of high-profile product liability claims and commercial disputes.
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Litigation: Product Liability - New Jersey

1
Band 1
Individual Editorial
Diane Sullivan of Weil, Gotshal & Manges comes highly recommended for her handling of high-profile product liability claims and commercial disputes.
View ranking table

Product Liability & Mass Torts - USA - Nationwide

1
Band 1
Individual Editorial
Diane Sullivan is an esteemed trial lawyer with experience acting as lead counsel on numerous market-leading mass torts. Alongside her experience in representing Fortune 500 companies on nationwide talc litigation, she is also active in environmental and natural resource cases.
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Strengths

Provided by Chambers

"Diane continues to try high-stakes cases around the country and achieves enormous success for her clients."

Litigation: Trial Lawyers respondent
USA

"Diane is an effective lawyer."

Litigation: Trial Lawyers respondent
USA

"She is a fantastic trial lawyer."

Litigation: General Commercial respondent
USA

"Diane is an effective lawyer."

Product Liability & Mass Torts respondent
USA

"She is a great and active attorney."

Product Liability & Mass Torts respondent
USA

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