Paul Weiss

1285 Avenue of the Americas
New York, NY 10019-6064
212-373-3213 (direct)
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A partner in the Litigation Department and co-chair of the Antitrust Practice Group, Aidan Synnott focuses on antitrust litigation and compliance, intellectual property litigation and other complex commercial litigation.


Chambers USA describes Aidan as a "'high-class antitrust expert' noted for his responsiveness and strategic decision-making." He has extensive trial experience in state and federal courts as well as in alternative dispute resolution forums such as the American Arbitration Association. In addition, he frequently represents clients in antitrust investigations by the governmental agencies of the United States and the European Union.

Aidan's antitrust litigations representations include:

  • The Nielsen Company, the leading provider of television ratings in the United States, in winning summary judgment before the U.S. District Court for the Southern District of Florida, and confirming the victory on appeal to the  U.S. Court of Appeals for the Eleventh Circuit, in a monopolization case brought by Sunbeam Television Corp., the FOX affiliate station in Miami. Sunbeam had claimed that Nielsen's rollout of a new ratings measurement methodology was a violation of Section 2 of the Sherman Act. Sunbeam Television Corp. v. Nielsen Media Research, Inc., 763 F. Supp.2d 1341 (S.D. Fl. 2011), aff'd, 711 F.3d 1264 (11th Cir. 2013);
  • The successful defense of the Dun & Bradstreet, ACNielsen and IMS Inc. in a federal antitrust action brought by a large competitor, obtaining dismissal of the case on a pre-trial motion. Information Resources, Inc. v. Dun & Bradstreet Corp., 359 F. Supp. 2d 307 (S.D.N.Y. 2004);
  • For the New York City Transit Authority, obtaining dismissal of a claim for attempted monopolization of the market for bus simulators. Doron Precision Systems, Inc. v. FAAC, Inc., 423 F. Supp. 2d 173 (S.D.N.Y. 2006);
  • Acumen Brands, Inc., a leading retailer of western apparel, in obtaining dismissal, with prejudice, of a monopolization case brought by a competitor. Sell It Social, LLC v. Acumen Brands, Inc., 2015-1 Trade Cases P 79,114 (S.D.N.Y. 2015);
  • The defense of Sumitomo Chemical Company, one of the largest chemical companies in the world, in the vitamins price-fixing litigation. He has defended numerous other U.S. and foreign companies in cartel cases; and
  • Pfizer Inc. in successful settlements of class and opt-out actions alleging $11 billion in damages for monopolization of the market for Neurontin, a Pfizer pharmaceutical, through an alleged pattern of meritless patent litigations.

Antitrust merger investigation representations Aidan has led include:

  • Time Warner Cable in the ongoing Justice Department Second Request investigation of its proposed $78 billion acquisition by Charter Communications as well as in the prior abandoned proposal by Comcast Corporation to acquire it for $45 billion;
  • Pace plc in a Justice Department Second Request investigation of its $2.1 billion acquisition by ARRIS Group Inc., where the Justice Department closed its investigation without imposing any conditions;
  • Automatic Data Processing in a Second Request investigation by the Justice Department of its $500 million acquisition of a payroll and tax outsourcing competitor, ProBusiness, where the Justice Department closed its investigation without imposing any conditions;
  • Hewitt Associates Inc. in a Justice Department investigation of its proposed $4 billion acquisition by Aon, where the Justice Department closed its investigation without imposing any conditions;
  • Westcoast Energy in a Justice Department investigation of its $8 billion acquisition by Duke Energy, where the Justice Department closed its investigation without imposing any conditions;
  • The Nielsen Company in the FTC Second Request investigation of its proposed $1.25 billion acquisition of Arbitron, Inc., where the acquisition was approved in a consent decree which Aidan negotiated and which imposed minimal conditions;
  • Fidelity National Financial in the FTC Second Request investigation of its $3 billion acquisition of a title insurance competitor, Lender Processing Services, Inc., which was approved in a consent decree which Aidan negotiated and which required minimal divestitures.

Aidan's IP and other non-antitrust litigation representations  include:

  • A class of music publishers in their litigation against Napster, in which the publishers obtained an injunction against distribution of their musical works by Napster. The injunction was entered by the U.S. District Court for the Northern District of California and affirmed by the U.S. Court of Appeals for the Ninth Circuit. A&M Records, Inc. v. Napster, Inc., 284 F.3d 1091 (9th Cir. 2002);
  • A class of music publishers in the Grokster case, in which the music publishers ultimately prevailed before the U.S. Supreme Court. Metro Goldwyn Mayer Studios, Inc. v. Grokster, Inc., 125 S. Ct. 2764 (2005);
  • A class of music publishers in their litigations against and, both of which were settled favorably;
  • The National Music Publishers' Association, Inc. (NMPA)the Songwriters Guild of America and the Nashville Songwriters Association International in a trial in the Library of Congress resulting in the setting of advantageous new rates and terms for the mechanical license under Section 115 of the Copyright Act;
  • Digital Equipment Corporation in connection with its patent litigation against Intel Corporation, which lead to a settlement worth $1 billion to Digital;
  • The successful defense of Pitney Bowes Inc. in a shareholder class action attempt to enjoin its acquisition of Group One Software;
  • One of the largest container leasing companies in the world in a litigation against its insurance carriers, which was settled on favorable terms. He obtained dismissal of a securities class action against the same client before the United States District Court for the District of New Jersey;
  • The Nielsen Company in achieving the full dismissal and affirmance on appeal of multiple claims brought by New Delhi Television Company, an Indian broadcasting company, claiming corruption in the provision of TV ratings in India by a joint venture partly owned by Nielsen. Justice O. Peter Sherwood of the New York State Supreme Court granted Nielsen's motion to dismiss in full from the bench at oral argument on the motion. New Delhi Television Ltd. v. Nielsen Holdings, N.V., 111 A.D.3d 437 (1st Dep't 2013); and
  • Obtaining summary judgment and affirmance on appeal for the estate of a successful businessman in a lawsuit by the deceased's former mistress alleging a right to large payments from the estate.  In the Matter of Cheng Ching Wang, 114 A.D.3d 939 (2d Dep't 2014).

Aidan is a fellow of the American Bar Foundation. He has been an associate editor of the Antitrust Law Journal, a member of the Editorial Board of the American Bar Association's Annual Review of Antitrust Law Developments, co-chair of the New York State Bar Association Section of Commercial and Federal Litigation's Committee on Antitrust and a member of the Executive Committee of the Section. He currently serves on the Executive Committee of the State Bar's Antitrust Section. He has been a guest lecturer and speaker at New York University School of Law, The Wharton School and the University of Michigan Law School, and has published extensively in the areas of antitrust and intellectual property law. Aidan is the co-author of the "United States" chapter in the last several editions of The Public Competition Enforcement Review and served as General Editor of the Sixth, Seventh and forthcoming Eight editions.

Aidan continues to be recognized by Chambers USAThe Legal 500U.S News & World Report/Best Lawyers in America and "The International Who's Who of Competition Lawyers & Economists" by Who's Who Legal.



  • LL.M., University of Michigan Law School, 1989
  • B.L., The Honorable Society of King's Inns, 1987
  • B.C.L., National University of Ireland (University College Cork), 1985

Bar Admissions

  • New York
  • Ireland

See Library Tab for articles, publications and presentations by Aidan Synnott

Related Resources

Dec 01, 2015 | News

DOJ Clears Way for Acquisition of Pace by ARRIS Group

Nov 10, 2015 | News

KPS Capital Partners to Sell Motor Coach Industries for $480 Million

Oct 27, 2015 | News

Ericsson Completes Acquisition of Envivio

Oct 08, 2015 | Publications

Recent Enforcement Actions Highlight Importance of Hart-Scott-Rodino Compliance When Acquiring Voting Securities

Sep 28, 2015 | Publications

Federal Judge Denies FTC’s Bid to Preliminarily Enjoin Steris-Synergy Health Merger

Aug 26, 2015 | News

CI Capital Completes Sale of KIK Custom Products

Jul 27, 2015 | Publications

FTC’s Challenge to Family Dollar/Dollar Tree Merger Suggests Potential for Significant Increase in Merger Enforcement

Jul 09, 2015 | Publications

Aidan Synnott Quoted in Law360 Article on Antitrust Litigation Involving Foreign Sovereign Compulsion

Jul 02, 2015 | Publications

Federal Judge Preliminarily Enjoins Sysco-US Foods Merger and Parties Abandon the Transaction 

Jun 30, 2015 | News

KIK Custom Products to be Acquired by Centerbridge Partners

Jun 03, 2015 | Publications

Second Circuit Applies Rule of Reason to Uphold Preliminary Injunction Preventing Manufacturer from Removing Alzheimer’s Drug from Market

May 26, 2015 | News

Charter Communications to Merge With Time Warner Cable

May 11, 2015 | Videos

New Beginnings: Helping Refugees Resettle

Apr 13, 2015 | Publications

Third Circuit Court of Appeals Joins Other Circuits in Applying Daubert to Expert Testimony at Class Certification

Mar 30, 2015 | Publications

Sixth Circuit Court of Appeals Adopts Below-Cost Standard for “Non-Explicit” Tying Arrangements

Mar 20, 2015 | News

Court Dismisses Antitrust Claims Against Acumen Brands

Feb 27, 2015 | News

Pro Bono Client Obtains Victory in Article 78 Proceeding Against DOCCS

Feb 27, 2015 | Publications

Supreme Court Holds State Regulatory Board Controlled by Active Market Participants Is Not Immune from Antitrust Liability 

Feb 17, 2015 | Publications

Court of Appeals Upholds Decision Unwinding Consummated Merger of Two Physician Groups Following FTC Suit

Feb 12, 2015 | News

Pro Bono Client Obtains Permanent Residency Status Under VAWA

Jan 26, 2015 | News

Aidan Synnott Contributes to Report on Deferred and Non-Prosecution Agreements in Antitrust Cases

Jan 23, 2015 | Publications

Fifth Circuit Reverses Jury Verdict for Antitrust Plaintiffs, Finding Lack of Sufficient Evidence to Establish a Conspiracy

Jan 21, 2015 | Publications

FTC Announces New Hart-Scott-Rodino and Clayton Act Section 8 Thresholds

Nov 26, 2014 | News

TRO Obtained for Pro Bono Client in Article 78 Challenge

Sep 30, 2014 | News

ADP Completes Spin-Off of Automotive Dealer Services Business

Aug 01, 2014 | News

Paul, Weiss Achieves Victory for Incarcerated Client

Jul 21, 2014 | News

Autocam Corporation To Merge With NN

Jun 30, 2014 | News

KPS Acquires Anchor Glass Container Corporation

Jun 07, 2014 | Publications

Aidan Synnott and Andrew Finch Co-Author Chapter on Recent Developments in U.S. Antitrust Law in The Public Competition Enforcement Review

May 06, 2014 | News

William Morris Endeavor Closes Acquisition of IMG

Apr 22, 2014 | Publications

Federal Court Rules “Loyalty Discounts” Do Not Violate Antitrust Laws Unless Below-Cost

Apr 14, 2014 | News

KPS to Acquire Anchor Glass Container Corporation

Feb 13, 2014 | News

Time Warner Cable to Merge with Comcast in $45 Billion Deal

Feb 03, 2014 | News

GMX Resources Successfully Emerges From Bankruptcy

Jan 27, 2014 | Publications

When Blue Turns to Grey: Grand Jury Subpoenas for Foreign Documents Produced in Civil Litigation

Jan 02, 2014 | Publications

Aidan Synnott Discusses IRAP in The American Lawyer

Dec 24, 2013 | News

Fidelity National Financial Receives FTC Clearance for Acquisition of Lender Processing Services

Dec 18, 2013 | News

William Morris Endeavor Announces Acquisition of IMG

Dec 02, 2013 | News

Aidan Synnott Appears on "The Firm"

Of Note

Jun 25, 2015

Paul, Weiss Honored by New York City Public Advocate

Jan 29, 2015

Benchmark Litigation Names Paul, Weiss “Antitrust Firm of the Year”

Oct 08, 2014

Paul, Weiss Honored at the 2014 Pro Bono Publico Awards

Jun 07, 2013

Chambers USA 2013
Ranks Paul, Weiss Highly

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