/Home/USA/Diane P Sullivan
Diane P Sullivan
Lawyers profile
USA 2025
Lawyers profile | USA 2025: 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

12 Years Ranked

1

Band 1

Product Liability & Mass Torts

USA - Nationwide

16 Years Ranked

1

Band 1

Litigation: General Commercial

New Jersey

14 Years Ranked

1

Band 1

Litigation: Product Liability

New Jersey

6 Years Ranked

Ranked in Guides
Global 2025

About

Provided by Diane P Sullivan

USA

Practice Areas

Diane Sullivan is a renowned trial attorney who is routinely retained as lead trial counsel in high-stakes litigations involving “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 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, Duke Energy, ESPN, ExxonMobil, Frontier Communications, General Electric, GlaxoSmithKline, Merck, PepsiCo., 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

Chambers Guide to the 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.
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.
View ranking table

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.
View ranking table

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

Strengths

Provided by Chambers

Dianne Sullivan is a premier trial lawyer in the country.

Litigation: Trial Lawyers respondent
Chambers Guide to the USA

Diane is one of the best trial lawyers ever in the country.

Litigation: Trial Lawyers respondent
Chambers Guide to the USA

She is a brilliant trial lawyer. If your company is in a tight spot, you go to her.

Litigation: Trial Lawyers respondent
Chambers Guide to the USA

She is one of the best trial lawyers in the country.

Litigation: Trial Lawyers respondent
Chambers Guide to the USA

She is one of the best trial lawyers in the country.

Product Liability & Mass Torts respondent
Chambers Guide to the USA

She is a brilliant trial lawyer. If your company is in a tight spot, you go to her.

Product Liability & Mass Torts respondent
Chambers Guide to the USA

Dianne Sullivan is a premier trial lawyer in the country.

Product Liability & Mass Torts respondent
Chambers Guide to the USA

Diane is one of the best trial lawyers in the country.

Litigation: General Commercial respondent
Chambers Guide to the USA

Discover other Lawyers at
Weil, Gotshal & Manges LLP

Provided by Chambers
Filter by
Band

California

Banking & Finance
2
Gabriel F Gregson
2
Band 2
View Profile
Litigation: General Commercial
3
David R Singh
3
Band 3
View Profile
4
Bambo Obaro
4
Band 4
View Profile
Media & Entertainment: Transactional
2
Tom K Ara
2
Band 2
View Profile
Private Equity: Buyouts
2
Craig Adas
2
Band 2
View Profile
2
Kyle C Krpata
2
Band 2
View Profile
3
Tana M Ryan
3
Band 3
View Profile
Technology
1
Karen N Ballack
1
Band 1
View Profile
U
Max Scott
U
Up and Coming
View Profile

California: Northern

Tax
4
Jason R Vollbracht
4
Band 4
View Profile

California: San Francisco, Silicon Valley & Surro

Corporate/M&A
4
Kyle C Krpata
4
Band 4
View Profile

District of Columbia

Antitrust
2
Jeffrey H. Perry
2
Band 2
View Profile
2
Michael Moiseyev
Head of Antitrust
2
Band 2
View Profile
4
John E Scribner
4
Band 4
View Profile
5
Brianne Kucerik
Head of Antitrust
5
Band 5
View Profile
Environment: Mainly Transactional
1
Annemargaret Connolly
1
Band 1
View Profile
3
John O'Loughlin
3
Band 3
View Profile
3
Matthew Morton
3
Band 3
View Profile
Litigation: General Commercial
2
Andrew Tulumello
2
Band 2
View Profile
Litigation: Securities
1
Robert Stern
1
Band 1
View Profile
20 of 108 results