Louis Tompros is an experienced first-chair trial and appellate litigator. He makes the fast-moving and legally complicated field of intellectual property understandable for juries and judges. He has handled the most challenging patent, trademark, copyright, publicity, and defamation matters at trial and on appeal, for high profile clients in technology, entertainment, artificial intelligence, and alternative energy, and he has been hailed as a "prizefighter" in the world of intellectual property litigation. He has successfully tried multiple intellectual property cases to verdict as lead trial counsel, has successfully argued multiple appeals before the Federal Circuit, and teaches patent trial advocacy at Harvard.

Among Mr. Tompros’s first-chair trial successes in his representation of Bombardier Recreational Products, in which a federal jury returned a full defense verdict rejecting a $130 million trademark infringement claim brought by Jaguar Land Rover over its “Defender” trademark. Land Rover had previously won a similar case against BRP in the European Union, making this US jury trial win particularly significant, and earning Mr. Tompros the title of “Litigator of the Week” from The American Lawyer. In 2021, he secured a high-profile victory for recording artist Elizabeth Chan over singer Mariah Carey, in which the Trademark Trial and Appeal Board permanently rejected Carey’s attempt to register the trademark “Queen of Christmas.”  The win resulted in widespread industry and media praise, including coverage in the New York Times, the Wall Street Journal, Variety, and People. In addition, Mr. Tompros has handled complex and controversial trademark matters implicating questions of free speech in federal courts nationwide.

In the patent space, Mr. Tompros has handled cases involving smartphones, semiconductors, alternative energy, powersports vehicles, DNA testing, power conversion, data encryption, video compression and plastic storage devices. In 2022, he was lead trial counsel for a defendant in a case resulting the invalidation of a competitor’s asserted patent, and in 2021, he successfully argued a summary judgment motion resulting in the elimination of more than $5 billion of a patent plaintiff’s damages claim. He has likewise prevailed in multiple inter partes review and reexamination proceedings before the Patent Trial and Appeal Board.

Mr. Tompros also represents visual and conceptual artists, filmmakers, agencies, video game publishers, authors and celebrities in copyright infringement, publicity, and defamation actions, including the creator of the famous “Pepe the Frog” comic book character in enforcement efforts to reclaim the character from “alt-right” entities. His successful copyright enforcement action against Alex Jones’s Infowars media platform was named one of the top copyright rulings of the year by Law360, and is the subject of the Emmy-winning and Sundance prize-winning documentary Feels Good Man. He has also represented clients in defamation, trade dress, unfair competition, trade secret and design patent matters in courts throughout the country, and is frequently cited as an authority in the application of intellectual property law to evolving internet phenomena, including artificial intelligence, memes, deepfakes and NFTs. 

As an appellate lawyer, Mr. Tompros regularly appears before the United States Court of Appeals. His Federal Circuit advocacy as lead counsel in (among other cases) Arctic Cat Inc. v. Bombardier Recreational Products Inc., In re Klein, and In re Packard has shaped the patent law. The Klein case, for example, resulted the Patent Office issuing a public agency-wide memo instructing all patent examiners on new rules for patent examination.

Pro bono representation is also an important part of Mr. Tompros’s practice. He represents civil rights icon James Meredith in a complex trademark dispute with the University of Mississippi, and previously represented Save the Children in its trademark enforcement activity against members of the “QAnon” movement. He has represented artists, authors, and a prominent literary journal on a pro bono basis in copyright and intellectual property contract matters, including representations through the Volunteer Lawyers for the Arts. He has represented terminated employees in unemployment insurance claims and appeals, public housing tenants facing eviction, and public advocacy groups submitting amicus briefs on criminal defense and privacy issues. In one of his early cases, Mr. Tompros represented a group of gay and lesbian service members challenging the constitutionality of the military’s “Don’t Ask, Don’t Tell” policy, in association with the Servicemembers Legal Defense Network.

While attending Harvard Law School, Mr. Tompros was Supreme Court Chair of the Harvard Law Review and a member of the winning team in the Ames Moot Court Competition.

Community Involvement

Mr. Tompros is the Chair of the Equal Justice Coalition of Massachusetts, a collaboration between the Massachusetts Bar Association, Boston Bar Association, and Massachusetts Legal Assistance Corporation committed to ensuring access to civil legal aid for low-income residents of Massachusetts. Mr. Tompros is also Chair of the Leadership Council of the WilmerHale Legal Services Center of Harvard Law School, the oldest and largest clinical teaching facility at the law school, which serves 1,200 low-income clients annually out of its Jamaica Plain office. In addition, Mr. Tompros serves on the board of trustees of The Learning Project Elementary School and has served as a warden of St. John’s Episcopal Church in Charlestown, Massachusetts.

Professional Activities

Mr. Tompros is a Lecturer on Law at Harvard Law School, where he teaches the popular Patent Trial Advocacy course. He has also been a guest lecturer at the Harvard Law School on the topics of discovery and civil procedure, and at the Harvard Business School, the Tuck School of Business at Dartmouth, Harvard University on the topics of copyright and artificial intelligence and the Questrom School of Business at Boston University on intellectual property. He appears frequently on national, and international television and radio programs on the topics of artificial intelligence, intellectual property, defamation, counter-disinformation litigation, and legal implications for next-generation technologies. Mr. Tompros serves on the advisory board of the Naples Roundtable and has spoken regularly at the Leahy Institute of Advanced Patent Studies. In 2011, he coached the Harvard Law School team that won the American Intellectual Property Law Association’s 2011 national Giles Sutherland Rich Memorial Moot Court Competition.

As a member of the WilmerHale Privilege Standing Committee, Mr. Tompros has spoken on the scope and applicability of the attorney-client privilege and work product doctrines. He has also served on the American Intellectual Property Law Association's Trademark Litigation Committee and has contributed material to the AIPLA Trademark/Trade Dress Update.

Mr. Tompros chairs the firm’s Boston Associates Committee, and is a member of the firm’s Boston Hiring Committee, Diversity Committee and Workload Committee. He also serves the executive committee of the Alan D. Lourie Boston Intellectual Property American Inn of Court.