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Mayer Brown

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John Mancini

Work +1 212 506 2295
Mayer Brown

Work Department

Intellectual Property


John Mancini is a Partner in Mayer Brown's New York office and Co-Chair of the Firm's Global Intellectual Property Practice Group, which has been ranked as one of the leading IP Practice groups globally. In addition, John is also a member of the Firm's Partnership Board. John's practice focuses on litigating patent, copyright, trademark, trade dress and trade secret disputes in federal and state courts across the country, as well as before the ITC, USPTO, and TTAB. John has represented both public and private companies in a wide range of industries and has successfully tried numerous complex intellectual property cases to successful bench and jury verdicts, all as lead counsel. In particular, John has represented some of the leading technology, media and telecom companies, as well as some of the leading global consumer brands, including: Google, Motorola Mobility, YouTube, Virgin Media, Nestlé, Kellogg, and Avago Technologies. John has been at the forefront of numerous disputes that have shaped intellectual property law, especially disputes involving the convergence of new media, the internet, and new technologies. For his various litigation victories for notable clients in these areas, John was named an "Intellectual Property MVP" by Law360 in 2013. John's experience as lead counsel in numerous complex matters and exposure to a wide variety of intellectual property issues affecting his clients has also enabled him to successfully resolve matters expeditiously and consensually on behalf of his clients. In addition, John works with clients on intellectual property counseling and transactional matters, frequently advising clients in connection with their overall IP protection and brand-building strategies, including licensing, disposition, and securitization of intellectual property assets. John also regularly advises clients, particularly financial institutions and insurance companies, on compliance with privacy and security obligations relating to the storage, maintenance, and transfer of non-public personal information, and on minimizing liability for unauthorized access to such information, including identity theft. John is ranked as one of the "leading lawyers" for trade secret litigation by the Legal 500 and is also ranked in New York Super Lawyers, Managing Intellectual Property and IAM 1000. John has been recognized by Legal 500 as: "very professional and ready to spend all the time he can give to the case"; "approachable and experienced"; "an excellent negotiator and advocate" and "is praised for his 'very deep experience, on both traditional and contemporary copyright issues'".


Georgetown University Law Center, JD 1989 Editor in Chief, The Tax Lawyer Fairfield University, BA 1986 Headmaster Scholar; Alpha Sigma Nu

United States: Intellectual property


Within: Copyright

Mayer Brown's team is led by John Mancini, who 'has incredible knowledge and understanding of copyright infringement disputes'. Music streaming service Spotify regularly engages Mancini, and a recent highlight involved a royalties dispute brought by folk singer Melissa Ferrick. Litigator Allison Levine Stillman is also highly recommended.

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Trade secrets (litigation and non-contentious matters)

Within: Leading lawyers

John Mancini - Mayer Brown

Within: Trade secrets (litigation and non-contentious matters)

The trade secrets team at Mayer Brown is led by New York-based John Mancini, who is heavily involved in trade secrets disputes. He acted for Swoogo in a dispute concerning alleged trade secret and unfair competition brought against former employees. Dale Giali is a noteworthy name form the Los Angeles office and focuses on the food and beverage sector.

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Trademarks: litigation

Within: Trademarks: litigation

Mayer Brown acts for various clients in the food and beverage industry such as Nespresso, Goya Foods and Capri Sun. In New York, practice head John Mancini represents NestlĂ© in a suit filed against Crest Foods for the breach of master franchisee agreements governing the use of the ‘NESTLÉ’ and ‘TOLL HOUSE’ trademarks. The defendant is accused of multiple breaches of the agreement including the use of the ‘NESTLÉ’ mark on non- NestlĂ© products. Elsewhere, Richard Assmus in Chicago and New York-based Allison Levine Stillman are other key names.

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