Recognized since 2010
New York, New York
Litigation - Securities
Gregg Mashberg is co-head of the Securities Litigation & Enforcement Group and a former Chair of the Litigation & Dispute Resolution Department. He has a broad-based practice and experience before numerous judicial and administrative forums.
Gregg has a particular focus on securities litigation, defending public companies and their directors and officers in class actions, SEC investigations and enforcement actions. Gregg also has broad experience in defending directors and officers in shareholder derivative actions and direct breach of fiduciary duty suits under state law.
As part of his securities litigation practice, Gregg is outside litigation counsel for The Depository Trust & Clearing Corporation and its subsidiaries, the nation's principal securities settlement and depository institutions. He has litigated in trial and appellate courts around the country, successfully defending against claims challenging the securities clearing and settlement system.
Gregg also has substantial litigation experience involving core aspects of Proskauer’s litigation practice, including general commercial disputes, antitrust, bankruptcy, entertainment, sports, First Amendment and trade secrets. He recently won summary judgment in a commercial dispute on behalf of a major British company, dismissing a complaint seeking $100 million in damages. Gregg is an experienced courtroom lawyer; for example, he won a $3 million federal jury verdict in a stockholders’ derivative action in a case involving the closing of a Wall Street brokerage house.
Following law school, Gregg spent five years in the New York City Corporation Counsel's Office, becoming an Assistant Chief of the General Litigation Division. In that position, Gregg was lead counsel for the City in major institutional change class actions. He also represented the City in litigation concerning significant public policy disputes.
Since entering private practice, Gregg has maintained his interest in public law, most recently serving as lead counsel to the Metropolitan Transportation Authority in successfully defending against challenges to the MTA’s 2003 decision to raise fares and tolls in the amount of $900 million.
Recognized in The Best Lawyers in America® 2023 for work in:
- Litigation - Securities
- Commercial Litigation
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