Greg Halperin is a trial lawyer trusted by leading life sciences and technology companies to handle their most consequential product liability and mass tort litigations. He has participated in some of the country’s most closely watched trials, including on behalf of pharmaceutical manufacturers and distributors and social media operators, and has secured significant victories at every stage of litigation—from dispositive motions through trial and appeal.
Greg currently represents Meta in more than 5,000 personal injury, public nuisance, and consumer protection lawsuits alleging teen mental health harms related to social media use. Prior to that, he played a central role in securing a complete defense verdict in the first opioids case involving wholesale distributors to reach a verdict, and he obtained significant trial, appellate, and dispositive victories in multidistrict litigations (MDLs) and coordinated state-court proceedings involving Roundup, Pradaxa, Mirena, and Accutane, among others.
Greg represents clients in every phase of complex product liability and mass tort litigation. His experience spans summary judgment and Daubert motions, bench and jury trials, post-trial motions, arbitration, appeals, and strategic counseling. He has prepared and defended senior executives in depositions, and he has deposed purported whistleblowers and key science experts. He has also authored amicus briefs before the U.S. Supreme Court and testified before the Advisory Committee on Civil Rules about procedural rules for MDLs.
For the past several years, Greg has been ranked by Chambers USA as an Up-and-Coming lawyer in Product Liability and Mass Torts. He has also been recognized as a Rising Star by both Law360 and Super Lawyers (New York and Washington, DC), is listed on Best Lawyers’ Ones to Watch list, was named an American Lawyer Litigator of the Week Runner-Up for his role in securing the first defense verdict in a multi-plaintiff Roundup trial, and received the Outstanding Contributor Award from Lawyers for Civil Justice for his work advancing reforms to the procedural rules governing mass tort litigation.
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