Adeel A. Mangi - Alliance for Justice

Adeel A. Mangi


Nominee to the U.S. Court of Appeals for the Third Circuit

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On November 15, 2023, President Joe Biden nominated Adeel A. Mangi to serve on the U.S. Court of Appeals for the Third Circuit. Mangi is currently a partner at Patterson Belknap Webb & Tyler LLP. If confirmed, Mr. Mangi will be the first Muslim to serve as a federal appellate court judge.


Adeel Mangi was born in 1977 in Karachi, Pakistan. He earned a First Class Degree in Law from the University of Oxford, Pembroke College, in 1998. He earned his Postgraduate Diploma in Professional Legal Skills from the City University London Inns of Court School of Law in 1999 and his LL.M. from Harvard Law School in 2000.

Legal Experience

After his graduation from Harvard Law School, Mr. Mangi joined Patterson Belknap Webb & Tyler LLP as an Associate, in which capacity he served from 2000-2009. He was promoted to Counsel in 2009 and became a Partner in 2010. He has consistently demonstrated exceptional skills as a versatile civil litigator during his impressive 23-year tenure at Patterson Belknap Webb & Tyler LLP. Over the years, he has handled intricate commercial litigation in state and federal courts across the nation.

Mr. Mangi’s extensive legal experience spans a diversity of fields, including commercial joint venture agreements, false advertising, trade secret misappropriation, antitrust issues, consumer protection, and class action lawsuits. Most of his clients have been major corporations in a variety of industries. Furthermore, Mr. Mangi has demonstrated his commitment to civil rights by taking on noteworthy cases pro bono. He has managed appeals in both federal and state cases.

Professional Activities and Accolades

Benchmark Litigation named Mr. Mangi to its 2024 and 2023 lists of the “Top 100 Trial Lawyers” in the U.S. This elite group consists of partners venerated by peers and clients for excelling at the nuanced practice of trial law. This award is given based on representative work, including both confidential and public materials. He also received the “Client Service All-Star” award from The BTI Consulting Group. This award recognizes attorneys who “stand above all the others in delivering the absolute best in client service’’ Mr. Mangi has also been named a “Rising Star” by the New York Law Journal and a “Rising Star” by the Minority Corporate Counsel Association’s Diversity & the Bar magazine. He was previously named as one of the National Asian Pacific American Bar Association’s “Best Lawyers Under 40.” This list recognizes “the achievements of the nation’s most accomplished legal partners” aged 40 and under.

The following cases are representative of Mangi’s legal career:

Ramsay-Nobles et al. v. Keyser et al.

No. 1 :16-cv-0577 (S.D.N.Y.).

In Ramsay-Nobles, Mr. Mangi represented the sister and estate of Karl Taylor, an incarcerated African American man suffering from mental illness at a New York state correctional facility. The Taylor family alleged he was killed by white corrections officers as retribution for having struck some of the officers. Serving as lead counsel, Mr. Mangi brought the case to trial in 2020 in the Southern District of New York. After almost two weeks, just before closing arguments, the parties settled for $5 million. As part of the settlement, New York agreed to install a comprehensive network of video cameras and microphones throughout facility where Mr. Taylor died.

Bayonne Muslims et al. v. City of Bayonne et al.

No. 2:17-cv-03731 (D.N.J.).

From 2017 to 2018, Mr. Mangi served as lead counsel for a local Muslim group and its officers in a successful challenge to Bayonne over its Zoning Board’s denial of an application to build a mosque. Mr. Mangi secured a settlement for the plaintiffs that included a large monetary payment and led to permission for construction of the mosque to proceed. The mosque recently opened after completion of construction.

Appian Corporation v. Pegasystems, Inc.

No. 2020-07216, appeal filed, No. 1399-22-4.

From 2021 to the present, Mr. Mangi has represented Appian Corporation, a software manufacturer, in a trade secrets dispute against Pegasystems Inc., which sells competing software. Mr. Mangi is lead counsel for the plaintiff. The case was the subject of two jury trials in 2022, one surrounding the statute of limitations under Virginia procedural law and a second, seven-week trial on the merits. At the conclusion of the latter trial, the jury awarded Appian more than $2 billion in damages for theft of trade secrets, finding that Pegasystems had acted willfully and maliciously and in violation of the Virginia Computer Crimes Act. The trial judge denied motions to set aside the verdict and awarded Appian attorney fees totaling $23 million. Following the defendant’s appeal, Mr. Mangi argued once more for Appian before the Virginia Court of Appeals.

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