A. John P. Mancini

Electronic Discovery & Information Governance, Intellectual Property Counseling & Prosecution, Trademark Litigation

“very professional and ready to spend all the time he can give to the case” and “praised for his ‘very deep experience, on both traditional and contemporary copyright issues.’”
The Legal 500

Visión general

John Mancini is a partner in Mayer Brown’s New York office and a member of the global Intellectual Property practice, which was named IP Practice Group of the Year for 2017 and 2020 by Law360. John has served in various firm management roles, including, current global co-chair of the Technology Industry Group, prior tenure as global co-chair of the Intellectual Property practice, and as past member of the firm’s Global Partnership Board. John's practice focuses on litigating copyright, trademark, trade dress, trade secret and patent disputes in courts across the country, as well as before the Copyright Royalty Board (CRB), the United States International Trade Commission (ITC), the United States Patent and Trademark Office (USPTO) and the USPTO Trademark Trial & Appeal Board (TTAB). John has successfully tried numerous complex intellectual property cases to successful bench and jury verdicts, all as lead counsel. In his practice, John has represented both public and private companies in a wide range of industries, with a particular concentration on the representation of technology, media and telecom companies, such as Google, YouTube, LG, Spotify and AT&T.



  • Represented Google and YouTube in defense of related cases for alleged copyright infringement relating to videos posted by users on YouTube. Won summary judgment in a landmark decision that held the Digital Millennium Copyright Act's "safe harbor" provision protects YouTube against liability for the presence of allegedly infringing videos on the site.  Widely-regarded as one of the most important copyright decisions of the digital age, The New York Times noted that the ruling “could have major implications for the scores of Internet sites.” (Viacom v. YouTube, Inc. (USDC SDNY)).
  • Represented Spotify and other music streaming services both before the Copyright Royalty Board and the D.C. Circuit to determine the royalty rate to be paid by all interactive music services, including Spotify, for the mechanical license fees to be paid to music publishers for the musical composition streamed on their services.  The determinations in this closely-closely watched proceeding and eventual appeal have been cited as some of the most significant rulings in the Board’s history,   Determination of Rates and Terms for Making and Distributing Phonorecords. Docket No. 16-CRB-0003-PR (2018-2022) (CRB).


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


  • Nueva York
  • Connecticut


  • US Supreme Court
  • US Court of Appeals for the Federal Circuit
  • US Court of Appeals for the Second Circuit
  • US District Court for the Southern District of New York
  • US District Court for the Eastern District of New York
  • US District Court for the District of Connecticut
  • US District Court for the Eastern District of Wisconsin
  • US District Court for the Western District of Wisconsin
  • US District Court for the Northern District of Illinois
  • US District Court for the Eastern District of Michigan
  • US District Court for the Western District of Tennessee
  • US Tax Court

Participación Profesional y Comunitaria

  • Board Member, New York Intellectual Property Law Association (NYIPLA)
  • International Trademark Association (INTA)
  • American Intellectual Property Law Association (AIPLA)
  • The Sedona Working Group on Best Practices in Patent Litigation 
  • Executive Committee, New York State Bar Association Intellectual Property Law Section