Adeel Mangi

Linklaters - New York

Chair of the Trial Practice and Litigation, Arbitration & Investigations Partner

1290 Avenue of the Americas
New York, New York, 10104, United States

+1 212 903 9312

Litigation Star

Top 100 Trial Lawyers

Fluent in Urdu and is conversational in Hindi and Sindhi.


Jurisdiction:

New York
Top Trial Lawyers

Practice area:

Commercial
False advertising
Food and beverage
Intellectual property


Adeel Mangi is the Chair of the Trial Practice at Linklaters. For four consecutive years (2023-2026), Benchmark Litigation has named Adeel to its lists of the “Top 100 Trial Lawyers” in the U.S., which consists of “partners who have been venerated by peers and clients as being the best in breed at the nuanced practice of trial law . . . based on an intensive peer-and-client review." Benchmark Litigation also named Adeel as a Litigation Star for each of the last four years (2023-2026) and has noted that peers describe Adeel as “meticulous and relentless,” and “an unflappable whiz at everything he does.”  

Adeel was nominated to the Third Circuit by President Biden. That nomination expired without a vote in the United States Senate after the 2024 presidential election. Adeel was the first Muslim-American ever nominated to a Circuit Court of Appeals. He wrote a letter to President Biden regarding his nomination that was described by one commentator as “required reading for anyone who wants to know how to deal with opponents of pluralism, diversity, and democracy.”  Adeel has received many professional awards and is currently nominated as one of three finalists for the New Jersey Law Journal’s 2025 Attorney of the Year.

Adeel secured the largest jury verdict in the history of the Virginia court system with a $2 billion verdict after a seven-week jury trial in a case involving theft of trade secrets in the software industry—the case is now on appeal. Adeel also secured the largest settlement with New York state in history in cases involving the death of a state prison inmate, on the morning of closing arguments after a two-and-a-half week jury trial in the Southern District of New York. Adeel leads trial teams in commercial litigations and arbitrations around the country.  


Updated Oct 2025

  • Johnson & Johnson: Adeel represents J&J as lead trial counsel in commercial litigations around the United States, including in state and federal courts. These include matters involving trade secrets, intellectual property, joint development disputes and complex commercial contracts. Adeel is presently representing J&J in lawsuits including a closely-watched case against insurance-related entities accused of misappropriating patient assistance funds; a royalty dispute relating to a blockbuster immune therapy; and a milestone-related dispute involving a facial surgery software product. These matters involve claims in the hundreds of millions of dollars.

  • Major medical device manufacturer: Adeel, as lead trial counsel, secured an arbitration award after a trial on the merits, defeating all claims against his client. The case involved claims of theft of trade secrets, tortious interference, and breach of contract (2024).

  • Appian Corporation: Adeel was lead trial counsel for Appian in a trial that led to the largest jury verdict in the history of the Virginia state court system with a verdict of more than US$2bn. That verdict came after a seven-week jury trial in a case involving the theft of trade secrets in the software industry. While the case is presently on appeal, Appian was able to secure US$500m of guaranteed payment by purchasing verdict preservation insurance. Adeel is currently also lead trial counsel for Appian in a separate federal lawsuit involving claims of false advertising and defamation.

  • Freedom of Religion: Adeel led teams representing Muslim congregations in Bernards Township and Bayonne in separate lawsuits challenging zoning and planning denials of permission to build mosques. Plaintiffs alleged that these denials were based in anti-Muslim animus. The lawsuits resulted in settlements in both towns under which the mosque received awards and fees totaling many millions and the mosques went ahead. Both mosques are now open.

  • Major private equity firm: representing various portfolio companies as lead trial counsel in litigations and disputes involving industries ranging from pharmaceuticals to pet food to cosmetics.  

  • Appellate
  • Arbitration
  • Commercial disputes
  • Dispute resolution
  • Plaintiff

  • Healthcare
  • Pharmaceutical and life sciences
  • Technology and telecommunications

  • LL.M. (Kennedy Memorial Scholar) - Harvard Law School - 2000
  • Barrister at Law - University of Oxford (Pembroke College) - 1998

  • Muslim Bar Association of New York - 2006

  • U.S. Supreme Court - 2018
  • U.S. Court of Appeals, First Circuit - 2008
  • U.S. Court of Appeals, Second Circuit - 2018
  • U.S. Court of Appeals, Third Circuit - 2014
  • U.S. Court of Appeals, Fourth Circuit - 2019
  • U.S. Court of Appeals, Fifth Circuit - 2012
  • U.S. Court of Appeals, Seventh Circuit - 2022
  • U.S. Court of Appeals, Eighth Circuit - 2016
  • U.S. Court of Appeals, Ninth Circuit - 2018
  • U.S. Court of Appeals, Federal Circuit - 2002
  • U.S. Court of Appeals, Eighth Circuit PACER - 2017
  • U.S. District Court, Southern District of New York - 2001
  • U.S. District Court, Eastern District of New York - 2001
  • U.S. District Court, Northern District of New York - 2002
  • U.S. District Court, District of New Jersey - 2018
  • New York - 2001
  • New Jersey - 2018