Ms Diane Sullivan > Weil, Gotshal & Manges LLP > Princeton, United States > Lawyer Profile

Weil, Gotshal & Manges LLP
17 HULFISH STREET, SUITE 201
PRINCETON, NJ 08542
United States
Diane Sullivan photo

Career

Diane Sullivan, a nationally recognized trial attorney, specializes in “first-of-kind” and/or “bet-the-company” cases in trials that have garnered extensive media coverage across a range of practice areas and industries. She is often retained in high-stakes litigations to serve as lead trial counsel. She represents Fortune 500 companies in mass tort, complex commercial, class action, antitrust, patent, and environmental litigations.

Memberships

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

Education

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

Lawyer Rankings

United States > Dispute resolution > Leading trial lawyers

(Hall of Fame)

Diane SullivanWeil, Gotshal & Manges LLP

(Leading trial lawyers)

Diane SullivanWeil, Gotshal & Manges LLP

Diane SullivanWeil, Gotshal & Manges LLP New York partner Diane Sullivan has a diverse trial practice, with a particular focus on healthcare and life sciences disputes and environmental mass torts. Among her ongoing mandates, Sullivan is serving as lead counsel to Sanofi in a multibillion-dollar antitrust case regarding Mylan’s auto-epinephrine medical device monopoly. At the same time, she has been acting for Repsol in litigation in New Jersey and Delaware arising from its alleged role in polluting the Passaic River in New Jersey, which represents one of the Environmental Protection Agencies’ largest Superfund projects in history.

Diane SullivanWeil, Gotshal & Manges LLP New York partner Diane Sullivan has a diverse trial practice, with a particular focus on healthcare and life sciences disputes and environmental mass torts. Among her ongoing mandates, Sullivan is serving as lead counsel to Sanofi in a multibillion-dollar antitrust case regarding Mylan’s auto-epinephrine medical device monopoly. At the same time, she has been acting for Repsol in litigation in New Jersey and Delaware arising from its alleged role in polluting the Passaic River in New Jersey, which represents one of the Environmental Protection Agencies’ largest Superfund projects in history.

United States > Dispute resolution > General commercial disputes

(Hall of Fame)

Diane SullivanWeil, Gotshal & Manges LLP

Weil, Gotshal & Manges LLP fields a ‘highly skilled and attentive’ nationwide team representing clients in commercial disputes and class actions covering consumer fraud, unfair competition, IP infringement, trade secrets and bankruptcy. among other areas. Among recent highlights, a team led by David Lender (New York) obtained a defense jury verdict in an $800m antitrust class action for its client C&S Wholesale Grocers, and Diane Sullivan (New Jersey) and Edward Soto (Florida) successfully defended Repsol against a multibillion-dollar fraudulent conveyance and environmental tort claim in New Jersey. Gregory Silbert (New York) continues to defend Farmers Insurance in multiple cases across the US involving allegations that the company violated antitrust and RICO laws, including a case which Silbert won in the Eleventh Circuit regarding complaints filed in Utah, Indiana and Mississippi. Jared Friedmann (New York) is also a standout litigator, with a strong corporate defense practice.

United States > Dispute resolution > Product liability, mass tort and class action - defense: consumer products (including tobacco)

(Leading lawyers)

Diane SullivanWeil, Gotshal & Manges LLP

With a breath of experience in product liability work Weil, Gotshal & Manges LLP  has assisted industry-leading companies in complex consumer class actions and mass torts. The firm can also draw on extensive regulatory expertise, advising clients and representing them in proceedings before relevant agencies and commissions. Moreover, the team has been praised for its ‘client-centric approach‘.  Following Arvin Maskin’s retirement in December 2020, acclaimed trial lawyer Diane Sullivan in Princeton now leads the group together with David Singh in Silicon Valley, who acts for some of the practice’s most high-profile clients. Silicon Valley-based Bambo Obaro was promoted to partner in January 2020 and plays a key role in several core matters.

United States > Dispute resolution > Product liability, mass tort and class action - defense: pharmaceuticals and medical devices

(Hall of Fame)

Diane SullivanWeil, Gotshal & Manges LLP

United States > Dispute resolution > Product liability, mass tort and class action - defense: toxic tort

Weil, Gotshal & Manges LLP combines broad industry coverage with extensive first chair trial experience and regulatory expertise to defend clients in a wide range of product liability and toxic tort disputes. This includes litigation commenced by states and municipalities, state attorney actions and nationwide consumer class actions. The team acts for clients in high-profile issues such as the talcum powder litigation, or disputes related to plastic pollution. Arvin Maskin, long at the helm of the firm’s practice, retired in December 2020. New Jersey-based Diane Sullivan, a star in the product liability and toxic torts space, now leads the practice together with recognized litigator David Singh in California. Bambo Obaro, who is involved in a wide array of product liability matters, was promoted to partner in January 2020.