Clifford H. Aronson serves as the North American leader of Skadden’s Antitrust/Competition Group. He focuses his practice on advising clients in antitrust matters relating to mergers and acquisitions.


Mr. Aronson has been involved in numerous high-profile transactions and strategic alliances across multiple industries, including entertainment, consumer products, health care, manufacturing, pharmaceutical, retail and technology. Mr. Aronson also has worked on numerous significant criminal and civil antitrust investigations (and resulting civil lawsuits) in various industries, including publishing, auction houses and cement. Mr. Aronson, who is listed in the top tier in Chambers USA: America’s Leading Lawyers for Business, also has been included repeatedly in Chambers Global: The World’s Leading Lawyers for Business, The Best Lawyers in America, Lawdragon 500 Leading Lawyers in America, The Legal 500 and Who’s Who Legal: Competition. Law360 selected Mr. Aronson as one of its “Competition MVPs” in 2012.

His representations include:

  • Rockwell Collins in its combination with United Technologies;
  • Mars Inc. in its acquisition of VCA Inc.;
  • E. I. du Pont de Nemours and Company in its merger with The Dow Chemical Company in an all-stock merger of equals with an announced value of $130 billion;
  • EMC Corporation on its $67 billion acquisition by Denali Holding Inc., the parent company of Dell Inc.;
  • Citrix Systems, Inc. on the merger of its GoTo business with LogMeIn, Inc. in a Reverse Morris Trust transaction valued at $1.8 billion;
  • Jos. A. Bank Clothiers Inc. in its unsolicited, but subsequently agreed upon, $1.8 billion acquisition by The Men’s Wearhouse, Inc.;
  • Tenet Healthcare Corporation in numerous acquisitions and dispositions, including its merger of Brookwood Medical Center into Baptist Health System, and its joint venture with John Muir Health to develop health care initiatives in the San Francisco Bay area;
  • Hospira, Inc. on its $17 billion acquisition by Pfizer Inc.;
  • Mount Sinai Hospital in its acquisition of Continuum Health Partners, Inc.;
  • The merger of Robert Wood Johnson Health System and Barnabas Health; SHFL Entertainment, Inc. in its US$1.3 billion acquisition by Bally Technologies, Inc.;
  • Express Scripts, Inc. in its $29.1 billion acquisition of Medco Health Solutions, Inc., including leading the litigation defense team in a last-minute private antitrust challenge to the transaction. This acquisition was recognized in the 2012 Financial Times “US Innovative Lawyers” report;
  • Cephalon, Inc. in defense of an unsolicited $5.7 billion takeover bid from Valeant Pharmaceuticals International, Inc. and its subsequent agreed upon $6.8 billion acquisition by Teva Pharmaceutical Industries Limited;
  • Endo Pharmaceuticals Holdings Inc. in numerous acquisitions, including its $8.1 billion acquisition of Par Pharmaceutical and its $1.6 billion acquisition of Paladin Labs Inc.;
  • Novell Inc. in its acquisition by Attachmate Corporation and in the concurrent sale of its intellectual property assets to CPTN Holdings LLC, a consortium of technology companies organized by Microsoft Corporation;
  • Wild Oats in its merger with Whole Foods, overcoming a challenge in federal court by the FTC;
  • Wm. Wrigley Jr. Company in its $23 billion acquisition by Mars Incorporated; and
  • News Corporation in the sale of the Dow Jones Index business to CME.

In addition to transactional matters, Mr. Aronson advises clients in other areas of antitrust and competition, including litigation and investigations. He also has assisted clients in planning legal strategies to address industry threats and opportunities. He represented Amylin Pharmaceuticals, Inc. in an antitrust lawsuit against Eli Lilly and Company in the U.S. District Court for the Southern District of California alleging antitrust violations and breach of a commercialization agreement for diabetes drugs, and in its subsequent $7 billion acquisition by Bristol-Myers Squibb Company. He also represented CEMEX S.A. de C.V. in numerous acquisitions as well as in connection with an antitrust price-fixing lawsuit brought by buyers of cement products in the U.S. District Court for the Southern District of Florida, which was in large part dismissed by the court.

Mr. Aronson represented HarperCollins, a subsidiary of News Corporation, in an investigation by the U.S. Department of Justice and various state attorneys general in connection with the pricing of e-books, as well as in private class action litigation brought against various publishers and Apple. He also successfully defended a high-tech company in a U.S. Department of Justice investigation into alleged hiring practices in the high-tech industry.

Additionally, Mr. Aronson represents clients before federal and state antitrust agencies and grand juries. For example, he represented Christie’s Inc. in connection with the U.S. Department of Justice’s auction house investigation and Christie’s successful amnesty application, as well as in connection with certain private class actions. He also advised Chicago Bridge & Iron in its appeal from a decision and order of the Federal Trade Commission requiring the divestiture of certain assets.

Mr. Aronson has been an instructor at the Wharton School at the University of Pennsylvania and is a regular speaker on mergers and acquisitions at Wharton’s Executive Education Program. He also was vice chair of the Mergers and Acquisitions Committee of the Antitrust Section of the American Bar Association.



  • J.D., Georgetown University Law Center, 1980
  • B.S., Wharton School, University of Pennsylvania, 1977 (cum laude)


  • New York
  • District of Columbia

Clifford H. Aronson