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Mayer Brown

Work +1 212 506 2500
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Joseph De Simone

Work +1 212 506 2559
Mayer Brown

Work Department



Joseph De Simone is an experienced, well-respected litigator whose practice is focused primarily on securities and regulatory disputes, internal corporate investigations, Sarbanes-Oxley compliance, complex arbitrations, and general corporate litigation. investigative cases. These include: Securities Litigation. Represents issuers, underwriters, and individual officers and directors in various federal securities class actions and derivative actions; counsels clients and boards of directors in connection with securities law issues. SEC and AG Enforcement. Represents corporations and individuals in investigatory proceedings and civil enforcement actions brought by the SEC and state attorneys general. Internal Corporate Investigations. Conducts and participates in internal corporate investigations on behalf of client management groups, audit committees, or special litigation committees in industry sectors such as banking, retail, Internet, technology, and broadcasting and communications. Sarbanes-Oxley Compliance. Counsels companies and their officers and directors on Sarbanes-Oxley litigation and compliance issues. Arbitrations. Arbitrates complex civil disputes in various arbitral venues, including the American Arbitration Association and ICC. General Civil Litigation. Represents corporate and individual clients in federal and state courts in a variety of civil actions, including commercial actions, contract disputes, breaches of fiduciary duty, employment, intellectual property, and mergers and acquisitions litigation. Pro Bono. Has successfully represented indigent clients in political asylum applications, a habeas corpus petition, death penalty litigation, and a special skills visa application; in 1998, received the Thurgood Marshall Award from the Association of the Bar of the City of New York for death penalty litigation; in 2004, received the Legal Aid Society’s Pro Bono Publico Award for outstanding work on a successful habeas corpus petition.


Arizona, 1998 New York, 1996 US Court of Appeals for the Second Circuit, 2001 US District Court for the Southern District of New York US District Court for the Eastern District of New York

United States: Dispute resolution

Securities litigation - defense

Within: Securities litigation - defense

Mayer Brown has 'a very strong practice across the board' and one client remarks that 'its litigation practice is first rate but reasonable in terms of cost'. The firm combines compliance, investigation, enforcement, litigation and appellate capabilities, and is frequently called upon by leading financial institutions. Joseph De Simone in New York and, in Washington DC, Richard Rosenfeld and Matthew Rossi are the lead partners. In New York, Matthew Ingber and Christopher Houpt acted for Bank of New York Mellon in litigation relating to its role as trustee of residential mortgage-backed securities, in which issues around the distribution of the $8.5bn settlement remain to be resolved. De Simone, Ingber and Richard Spehr handled securities and derivative actions for Frontier Communications that allege improprieties by its directors and officers. Steven Wolowitz, who handled high-stakes class actions for Société Générale, including In Re Libor-Based Financial Instruments Antitrust Litigation and Sonterra v UBS AG, et al, is also recommended.

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United States: Industry focus

Insurance: advice to insurers

Within: Insurance: advice to insurers

Mayer Brown's practice focuses on litigation, arbitration, appeals and investigations for insurers and reinsurers in relation to life, P&C, financial guaranty and mortgage guaranty policies. The client portfolio includes names such as Chubb, AXA Advisors, Liberty Mutual Insurance Company and Beazley. Securities litigator Joseph De Simone is the key contact in New York, while former Norton Rose Fulbright US LLP partners Robert Harrell and Jon Rice joined the Houston office in early 2018.

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