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Weil, Gotshal & Manges LLP

Work +1 609 986 1100
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Diane Sullivan

Work +1 212 310 8897
Weil, Gotshal & Manges LLP


Diane Sullivan is a nationally acclaimed trial attorney and a partner in Weil’s Litigation Department. She focuses on complex commercial and mass torts litigation for companies in a variety of industries, including pharmaceuticals, consumer products, energy, and chemicals. She has been recognized for her successful trial work by prominent legal and lay publications, and is a frequent author/speaker on topics relating to litigation and trial issues.


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


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

United States: Dispute resolution

General commercial disputes

Within: Leading lawyers

Diane Sullivan - Weil, Gotshal & Manges LLP

Within: General commercial disputes

The 'fearless, smart, savvy, and experienced' team at Weil, Gotshal & Manges LLP is 'well organized and very responsive' and acts for major US and multinational companies. In recent successes, 'brilliant litigator' David Lender and Eric Hochstadt obtained a complete defense jury verdict for client C&S Wholesale Grocers in an $800m antitrust class action in Minnesota, while David Yohai won an appeal for Discovery Communications at the Fourth Circuit in a content distribution dispute brought by one of the company's television distributors. Out of the Princeton office, 'excellent advocate' Diane Sullivan secured a victory for SAC Capital in long-running litigation when a New Jersey Superior Court granted the client's motion for summary judgment and dismissed the claims in a lawsuit with over $1bn at stake. Edward Soto in Miami co-chairs the team alongside Lender; David Singh is based in Silicon Valley. Named partners are based in New York unless otherwise stated.

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Leading trial lawyers

Within: Leading lawyers

Diane Sullivan - Weil, Gotshal & Manges LLP

Within: Leading trial lawyers

Diane Sullivan - Weil, Gotshal & Manges LLP Headline matters for 'terrific trial lawyer' Diane Sullivan includes acting as lead counsel for Johnson & Johnson in a unanimous defense verdict in New Jersey state court involving cancer claims pertaining to the client’s talcum powder product. Described as 'tough and fearless', Sullivan's reputation has brought her major class action suits for clients including Philip Morris USA. She continues to represent Exxon Mobil in a dispute that is expected to reach trial in the New Jersey federal court this year.

Within: Leading trial lawyers - ranked: tier 2

Diane Sullivan - Weil, Gotshal & Manges LLP

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Product liability, mass tort and class actions: consumer products (including tobacco) - defense

Within: Product liability, mass tort and class actions: consumer products (including tobacco) - defense

New York-based Arvin Maskin heads the product liability and mass tort practice at Weil, Gotshal & Manges LLP, which handles class actions and product liability lawsuits in the technology, cosmetics and sports sectors. The team represented Japanese fiber manufacturer Toyobo in the two final remaining cases related to the performance of zylon fiber in bullet-resistant vests, and also defended Dometic Corporation in a class action regarding an alleged defect in the cooling units of the client’s gas absorption refrigerators. Also of note, Diane Sullivan in New Jersey successfully represented Johnson & Johnson as lead trial counsel in one bellwether case involving allegations that asbestos contamination of baby powder led the plaintiff to develop mesothelioma. David Singh in Silicon Valley is another key member of the practice group.

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Product liability, mass tort and class actions: toxic tort - defense

Within: Product liability, mass tort and class actions: toxic tort - defense

Weil, Gotshal & Manges LLP is headed by New-York-based Arvin Maskin and is increasingly active in high-profile water contamination cases. In New Jersey, Diane Sullivan and Allison Brown are acting for Respol in environmental litigation filed against multiple defendants regarding the pollution of the Passaic River. Acting alongside New York-based David Lender, Sullivan is also representing Procter & Gamble as trial counsel in an action filed by the Suffolk County Water Authority alleging that the client manufactured and distributed products that leached a possible carcinogenic chemical into public drinking wells.

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