Lynn Neuner > Simpson Thacher & Bartlett LLP > New York, United States > Lawyer Profile

Simpson Thacher & Bartlett LLP
NEW YORK, NY 10017-3954
United States
Lynn Neuner photo

Work Department



An experienced trial lawyer specializing in shareholder, commercial, insurance and false advertising disputes. Representations include: Pfizer in numerous co-development and indemnity disputes; TD Bank in historic litigation related to Allen Stanford Ponzi scheme; Hovnanian in landmark securities case regarding credit default swaps; Travelers in centimillion-dollar pollution coverage action; Weight Watchers in large securities class action and related derivative suits; Bayer in advertising challenges regarding Claritin, Aleve and Maty’s Healthy Products; Pfizer in long-standing disputes regarding Advil and Tylenol; Ziegler Family businesses in shareholder disputes; multiple confidential international and U.S. arbitrations. Devotes significant pro bono counsel to U.S. veterans, including obtaining an historic ruling (together with Yale Law School’s Veterans Clinic) allowing veterans to bring class actions against the Department of Veterans Affairs in the Veterans Courts.


Global Co-Chair of Simpson Thacher’s Litigation Department; Executive Committee Member; former Co-Administrative Partner; former Co-Chair, Business Development, Recruiting, and Diversity Committees.


American College of Trial Lawyers; Board of Trustees of Practising Law Institute; Commercial Division Advisory Council; Co-Chair of City Bar Association Working Group on Litigation Funding; Steering Committee of Lawyers Committee of Inner-City Scholarship Fund; former Chair of Board of Yale Law School Alumni Fund.


Yale Law School (J.D., 1992), Co-Editor-in-Chief, Yale Journal on Regulation, Director, Barristers Union; Williams College (B.A., summa cum laude, 1989).

Lawyer Rankings

United States > Dispute resolution > General commercial disputes

(Leading lawyers)

Lynn NeunerSimpson Thacher & Bartlett LLP

The New York-based team of Simpson Thacher & Bartlett LLP impresses with in-depth know-how in a variety of disputes relating to securities, commercial contracts, bankruptcy, antitrust, business torts, insurance, class actions, government and internal investigations. Its client portfolio includes major national and international companies, often from the technology, pharmaceutical and insurance sectors, as well as financial institutions. A recent highlight is representing Twitter in successfully resolving multiple securities class actions and derivative lawsuits in the Northern District of California and San Mateo Superior Court. Civil securities-specialist Jonathan Youngwood leads the practice alongside Lynn Neuner, who is often engaged in litigation involving securities, mergers, insurance coverage and false advertising disputes. Bryce Friedman‘s broad practice encompasses strategic concerns, disputes and employee matters. Another name to note is Linton Mann III  who covers securities, shareholder derivative disputes, class actions, antitrust and complex commercial disputes. Former assistant US Attorney at the United States Attorney’s Office for the Southern District of New York Martin Bell joined the team in July 2021.

United States > Dispute resolution > Securities litigation: defense

At Simpson Thacher & Bartlett LLP, the practice is ‘adept at litigating, mediating and trying cases’, specializing in industry-challenging high-stakes securities matters, in both the regulatory enforcement arena and in securities litigation. Among high-profile examples in 2021 is the firm’s work for Twitter, which the firm represented in obtaining the dismissal of a Securities Act claim in the California Superior Court, and favorably settled another securities fraud class action. Jonathan Youngwood, who is ‘superior in securities litigation‘, leads the practice with Lynn Neuner, who took over the reins following the retirement of Paul Curnin. They are based in New York, where up-and-coming partner Craig Waldman is a also key member of the practice. Waldman was part of a team that defended Bausch Health Companies in a securities class action, numerous individual actions and a related RICO class action. In Palo Alto, James Kreissman, who led the Twitter case with Youngwood, and emerging talent Stephen Blake are the standout practitioners.

United States > Dispute resolution > Appellate: courts of appeals / Appellate: supreme courts (states and federal)

Simpson Thacher & Bartlett LLP‘s trial practice is the primary source of its appellate work and sources attest the firm ‘offers a one-stop shop in handling matters right from litigation to appeal‘. The New York-based group blends a strong commercial offering with an active pro bono practice, which ensures a markedly broad practice scope. Jonathan Youngwood is a ‘thoughtful and effective oral advocate‘ and is noted for his expertise in securities litigation, co-heading the team alongside Lynn Neuner. Other key names include Joseph McLaughlin, who has an emphasis on class actions and shareholder derivative suits, and of counsel Paul Curnin.

United States > Dispute resolution > Financial services litigation

At Simpson Thacher & Bartlett LLP, the financial service team is noted for its expertise in securities and derivatives litigation, where the practice represents prominent clients in a varied range of disputes. In 2021, the practice was highly active in defending banks in litigation related to their roles as underwriters of initial public offerings. The team has also recently handled a number of cases involving special purpose acquisition companies; a particular specialism of Jonathan Youngwood, who is regularly involved in cases relating to the Investment Company Act. Youngwood co-heads the practice and the firm’s global litigation department alongside Lynn Neuner. Elsewhere, the practice continues to represent prominent banks in antitrust cases, with a particular focus on rate and market manipulation claims, and the team’s work in enforcement and prosecutions includes representing clients facing investigations from the SEC and CFTC. Youngwood and Neuner are both based in New York, where Joseph McLaughlin and Craig Waldman are also names to note in securities litigation. The firm also boasts a strong presence on the West Coast, with James Kreissman a key figure in the Palo Alto office. The team brought on Marc Berger and Martin Bell in New York in June and July 2021, respectively; both partners have substantial governmental experience, with Berger joining from the SEC and Bell from the US Attorney’s Office for the Southern District of NY.

United States > Antitrust > Civil litigation/class actions: defense

With ‘a good mix of highly skilled partners, mid-level partners and associates’, Simpson Thacher & Bartlett LLP sports an antitrust practice that defends clients across every major industry with a deep understanding of both the DOJ and FTC. Having opened an office in Brussels in summer 2021, the firm has strengthened its international reach through close collaboration of the Brussels team with the US offices. Sara Razi and John Terzaken in Washington DC, as well as New York-based Peter Guryan head the antitrust and trade regulation practice. Also in New York, Lynn Neuner was recently appointed global co-chair of the firm’s litigation department alongside Jonathan Youngwood, whose expertise spans securities litigation and corporate control in addition to antitrust. DC-based Abram Ellis excels at antitrust matters related to financial instruments, employment issues, and the healthcare industry.

United States > Dispute resolution > M&A litigation: defense

Simpson Thacher & Bartlett LLP in New York has long been a market leader in M&A litigation and continues to be involved in cutting-edge matters, with a prime example is its work for technology company MultiPlan Corporation in the most prominent SPAC-related case in the market. The matter, in which MultiPlan was dismissed from the case, concerns allegations of breach of fiduciary duty in the merger with special purpose acquisition company Churchill III and claims that the merger was inherently conflicted. The case, led by practice co-head Jonathan Youngwood and up-and-coming partner Stephen Blake, is a milestone in reshaping the law to accommodate the unique qualities of SPACs. Paul Curnin retired in 2021, with seasoned trial lawyer Lynn Neuner taking up his role has global co-chair of litigation, alongside Youngwood. The firm has a deep bench of talented litigators, among them Peter Kazanoff, who is acting for Envision Healthcare Corporation in shareholder litigations concerning its $9.9bn sale to KKR; Palo Alto-based James Kreissman, who frequently acts for global technology companies; and Craig Waldman, who is also heavily involved in the Envision case.