Nigel Halliday is a litigation associate at Seeger Weiss, where he represents plaintiffs in some of the largest and most consequential multidistrict litigations in the country, as well as in class actions and state attorney general enforcement actions. Nigel’s practice encompasses a wide range of cases, including product liability, public nuisance, consumer protection, data privacy, antitrust, environmental, qui tam, securities, and complex commercial litigation.
Nigel regularly handles briefing in cases involving complex legal issues of first impression. For example, in the Social Media Adolescent Addiction/Personal Injury Products Liability Litigation MDL, Nigel was a key part of the team that persuaded the court to permit thousands of individuals and school districts alleging that major social media platforms negligently designed their platforms to foster compulsive use to bring their cases to trial. Nigel represented the Estate of Henrietta Lacks in a series of unjust enrichment cases arising from the wrongful taking of a biopsy in 1951 that led to the creation of the first immortal human cell line. He developed an innovative legal theory that would permit recovery in this unique fact pattern and persuaded the court to adopt that theory and to reject constitutional challenges raised by the defendant. Nigel also handled dispositive and Daubert briefing in multiple bellwethers in the National Prescription Opiate Litigation MDL. In State of Vermont v. 3M Company, Nigel came up with (and persuaded the court to endorse) a novel technique to protect his client from future arguments by big chemical companies that res judicata might prevent future enforcement actions related to a class of emerging environmental contaminants.
Nigel regularly first chairs depositions of key fact or expert witnesses. Among other cases, in the National Prescription Opiate Litigation MDL, Nigel first chaired depositions of key witnesses at a major pharmaceutical company and a major pharmacy chain. In New Jersey Department of Environmental Protection, et al., v. The Sherwin-Williams Company, he first chaired the deposition of the defendants’ lead damages expert. In State of Vermont v. 3M Company, he first chaired depositions of numerous witnesses at several large chemical companies and their affiliates.
Nigel is a member of the Sedona Conference and routinely litigates complex disputes regarding electronically stored information.
Nigel was listed in Best Lawyers: Ones to Watch for his work in plaintiff-side mass tort, class action, and product liability litigation in 2026. He was also selected for inclusion on Lawdragon’s 500 X – The Next Generation guides in 2023, 2024, and 2025. Best Lawyers: Ones to Watch is issued by Best Lawyers. The Best Lawyers selection methodology can be found here. The Lawdragon 500 X – The Next Generation award is issued by Lawdragon. The Lawdragon selection methodology can be found here. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
Prior to joining the firm, Nigel held a federal judicial clerkship with the Honorable Tu M. Pham, Chief U.S. Magistrate Judge for the U.S. District Court for the Western District of Tennessee. He first worked at the firm as a summer associate in 2018.
Nigel earned his J.D. from Vanderbilt Law School, where he was elected to the Order of the Coif, received multiple scholastic excellence awards, served as a managing editor of the Vanderbilt Journal of Entertainment & Technology Law, and worked as a research assistant to class action scholar Professor Brian Fitzpatrick, one of the country’s leading scholars on class action litigation.
He received his B.A. from Hendrix College, where he was elected to Phi Beta Kappa and received a number of awards, including the top undergraduate law award. He has contributed to legal and policy scholarship, including work on disparities in access to legal aid.
