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William Kolasky is a partner in the Washington, D.C. office of Hughes Hubbard. He has over 35 years of experience across the full range of antitrust litigation and counseling. Mr. Kolasky regularly represents clients in antitrust litigation before courts all over the country. He also represents clients in criminal and civil investigations before both the Antitrust Division and the Federal Trade Commission. He has secured antitrust clearance from the two agencies for more than 100 mergers and acquisitions, and has coordinated merger reviews in multiple other jurisdictions around the world. He also regularly counsels clients about antitrust aspects of a wide variety of business arrangements from joint ventures to distribution arrangement.

Mr. Kolasky served as Deputy Assistant Attorney General in the Antitrust Division of the US Department of Justice. While there, he was one of the architects of the International Competition Network, a network of over 100 competition authorities worldwide designed to promote great international cooperation and convergence among those authorities.

Professional Activities

Mr. Kolasky publishes and speaks regularly on antitrust law subjects in both the United States and Europe. He has taught antitrust law at the American University’s Washington College of Law. Mr. Kolasky has been active in the Section on Antitrust Law of the American Bar Association for many years and currently serves as an Associate Editor for their Antitrust Magazine.​

Previous Experience

  • Clerkship, the Honorable Bailey Aldrich, United States Court of Appeals for the First Circuit, 1971-1972​


  • Recipient of Global Competition Review’s 2013 Lifetime Achievement Award
  • Consistently recognized since 2005 as a national leader in antitrust in both Chambers Global and Chambers USA: America’s Leading Lawyers for Business
  • Recognized as a leader in his field in the 2009-2013 editions of Who’s Who of Competition Lawyers and Economists
  • Nominated by in-house counsel and peers for inclusion in the Guide to the World’s Leading Competition & Antitrust Layers, 8th Edition
  • Listed in the 2010, 2012 and 2013 editions of Benchmark Litigation for his leading antitrust practice
  • Recognized by his peers as one of the world’s leading antitrust attorneys in Legal Media Group’s The Best of the Best 2006 and The Best of the Best 2011
  • Selected by his peers as one of The Best Lawyers in America in the area of antitrust law each year since 2005
  • Selected by his peers as a “Super Lawyer” in the 2007-2013 editions of Washington DC SuperLawyers
  • Named by his peers as an elite practitioner in the field of competition and antitrust in the 2013 edition of Expert Guide’s: Best of the Best USA

Practice Groups and Other Information

Education Information

  • Harvard University School of Law, J.D., 1971
    magna cum laude
    Note Editor, Harvard Law Review
  • Dartmouth College, A.B., 1968
    magna cum laude

Bar Admissions

  • District of Columbia​

Highlighted Matters

  • Secured antitrust clearance for the mergers of the two largest regulated medical waste treatment providers and the two largest pallet suppliers in the U.S.
  • Secured dismissal of an antitrust class action challenging the bundling of cable programming and successfully defended the dismissal on appeal in the Ninth Circuit.
  • Settled all remaining claims against a major insurance carrier in the massive Insurance Brokerage multidistrict litigation after persuading the Third Circuit to affirm the dismissal of all federal antitrust and RICO claims against the client.​
  • Represented the largest magazine and paperback book distributor in the country in a series of government civil and criminal antitrust investigations and related private antitrust actions.
  • Represented a major TV station group owner in the U.S. in securing antitrust clearance for a series of acquisitions over a nearly 20-year period, including one currently pending before the Justice Department -  Antitrust Division.
  • Represented several major metropolitan daily newspapers in acquiring suburban community newspapers in their markets.
  • Provided antitrust advice to one of the owners of Hulu with respect to a possible restructuring.
  • Currently representing a major paper group in the country in an ongoing Justice Department investigation of amendments to a joint operating agreement and in a related private antitrust action seeking a preliminary injunction against the implementation of the amendments. 
  • Representation of Merck & Co. in connection with the $3.85 billion acquisition of Idenix Pharmaceuticals, Inc., a biotechnology company developing drugs to cure hepatitis C.

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