Gregory J. Casas

Gregory J. Casas


Gregory J. Casas is the Administrative Shareholder for the Austin office and focuses his practice on antitrust, complex business litigation, and energy and natural resources law. Greg's antitrust and complex business litigation practices are international in scope. His antitrust practice includes litigating price-fixing, bid-rigging, and market allocation claims, and providing counseling for DOJ/FTC investigations, joint venture formation, mergers and acquisitions, pricing plans, and other contractual relationships. Greg's complex business litigation experience includes class action defense, commercial disputes, and international dispute resolution in Latin America, Europe, and Africa. His energy experience includes litigating power plant construction disputes, oil and gas leases and joint operating agreement disputes.


  • Antitrust
  • Class action defense
  • International
  • Commercial
  • Energy and natural resources



  • Represented an association of physicians in suit alleging violations of Section 1 of the Sherman Act as well as common law torts such as tortious interference and business disparagement.
  • Represented a reseller of residential-mortgage-backed securities in putative class action filed in Travis County, Texas by state-affiliated investor.
  • Defended a "super-major" oil and gas company in a class action brought in Latin America by all purchasers of retail gasoline against "super-major" oil companies.
  • Represent a natural and organic food grocery chain in multiple pending class actions. Cases involve alleged overpricing of pre-packaged foods, improper labeling, wrongful termination claims, securities claims, and ERISA violations.
  • Counsel healthcare providers and hospitals about antitrust issues arising out of land-use restrictions, joint venture formation and negotiations with payors.
  • Represented a medical equipment rental company in antitrust action. Claims alleged arose under Sections 1 and 2 of the Sherman Act and Common Law Tort.
  • Represented an agency of eastern European country in MDL proceedings involving antitrust claims related to sale of certain commodities. 
  • Represent Chinese steel manufacturer in ITC proceeding alleging trade claims and antitrust violations arising from various manufacturers’ export of steel into U.S.
  • Provided counseling and represented domestic and international clients regarding Hart-Scott-Rodino filings and related Second Requests before the U.S. Department of Justice and Federal Trade Commissions. Industries involved included agriculture and gasoline, natural gas transmission, gasoline and crude oil transmission and refining, health care, hotels, and financial services.
  • Represented Houston-based hedge fund in suit arising out of a failed investment in a film finance company. The fund asserted claims for fraud and negligent misrepresentation. 
  • Coordinating Counsel for a national natural and organic foods grocery chain in various disputes in New Jersey, New York, Connecticut, Arizona, Florida, Texas, California and Illinois.
  • Represent key entity responsible for negotiating pricing programs and establishing distribution solution under HRSA’s Prime Vendor Program in a suit alleging violations of Section 1 of the Sherman Act, the Robinson-Patman Act, and Common Law Tort.
  • Represented Chinese-based designer and fabricator of semiconductors in claims against competitors related to financing and building a new fabrication plant in China. 
  • Represented Caribbean oil and gas producer in arbitration before the International Chamber of Commerce (ICC) regarding taxes from the purchase of offshore oil and gas leases.
  • Represented West African nation in disputes involving the development and sale of that country’s natural resources in proceeding before the ICC and ICSID, including representation of the country in the first ever Conciliation under ICSID’s Additional Facility Rules.

Sukcesy i wyróżnienia

  • Listed, Chambers USA Guide, 2012, 2015 and 2018-2019
    • "Recognized Practitioner," 2016-2019
  • Listed, Super Lawyers magazine, Texas Super Lawyers, 2010-2018
  • Rated, AV® Preeminent5.0 out of 5

°AV®, AV Preeminent®, Martindale-Hubbell DistinguishedSM and Martindale-Hubbell NotableSM are certification marks used under license in accordance with the Martindale-Hubbell® certification procedures, standards and policies.

  • Board Member, Ballet Austin
  • Advisory Board Member, Institute of Transnational Arbitration
  • Former Board Member, U.S./Mexico Bar Association
    • Former U.S. Co-Chair, Energy Committee
  • Member, American Bar Association, Antitrust Section
  • Member, Austin Bar Association
  • Member, District of Columbia Bar
  • Member, State Bar of Texas


  • J.D., with honors, Duke University School of Law, 1993
  • B.A., English and Economics, magna cum laude, Boston University, 1990
Posiadane uprawnienia
  • District of Columbia
  • Texas
  • U.S. Court of Appeals for the First Circuit
  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Third Circuit
  • U.S. Court of Appeals for the Fifth Circuit
  • U.S. Court of Appeals for the Ninth Circuit
  • U.S. Court of International Trade
  • U.S. District Court for the District of Columbia
  • U.S. District Court for the Eastern District of Texas
  • U.S. District Court for the Northern District of Texas
  • U.S. District Court for the Southern District of Texas
  • U.S. District Court for the Western District of Texas
Znajomość języków
  • hiszpański, konwersacyjny