Kostis Hatzitaskos

Vice President


  • Chicago


Kostis Hatzitaskos coheads Cornerstone Research’s antitrust and competition practice. Dr. Hatzitaskos focuses on antitrust litigation and merger investigations. Who’s Who Legal has recognized Dr. Hatzitaskos as a Global Leader among competition economists, and for five consecutive years also named him a Future Leader in the competition field.

His experience spans numerous industries, notably distribution, enterprise and consumer information technology, entertainment, financial services, food and agriculture, healthcare, health insurance, high-tech consumer products, renewable energy, semiconductors, shipping, telecommunications, and video games.

Antitrust merger reviews

Dr. Hatzitaskos supports clients and experts in all phases of merger review. On behalf of government agencies, merging parties, and third parties, he has consulted on numerous high-profile matters, including many matters that reached the litigation phase. He has consulted to the Department of Justice, the Federal Trade Commission, and international agencies.

Representative cases include:

Antitrust and competition

Dr. Hatzitaskos has analyzed class certification, liability, and damages issues in high-profile competition matters. His expertise includes cases alleging anticompetitive bundling, price fixing, price manipulation, monopolization, and monopsonization.

Intellectual property

Dr. Hatzitaskos has worked on a range of intellectual property matters. He led a team supporting Dr. Matthew Lynde in the landmark Microsoft v. Motorola trial, which addressed the determination of reasonable and nondiscriminatory (RAND) royalty rates. He has analyzed alleged patent infringement cases involving smartphones and conducted damages analysis in alleged copyright infringement matters.

Dr. Hatzitaskos has coauthored numerous publications on merger enforcement, economic methods, and the role of experts in antitrust and competition matters, including chapters in reference books and handbooks published by the ABA Section of Antitrust Law. He is a current member of the editorial board of the ABA’s Antitrust Magazine—Digital Edition and has served on the editorial board of the ABA’s Antitrust Source.

 A regular speaker and moderator at specialist and academic conferences, Dr. Hatzitaskos has participated in panels at Stanford, Fordham, Northwestern, and George Washington Universities.

Press Release

Chris Lau and Joe Podwol Join Cornerstone Research

Press Release

Cornerstone Research Named in GCR 2023 Matter of the Year


United States v. Bertelsmann Se & Co. KGaA et al.


EFN West Palm Motor Sales LLC v. Hyundai Motor America Corp. et al.


Selected Research and Writings of Aviv Nevo

Press Release

Cornerstone Research Named Among 2023 Outstanding Global Economic Consultancies


Trends in Merger Investigations and Enforcement at the U.S. Antitrust Agencies: FY 2011–FY 2020


In re China International Marine Containers Group and Maersk Container Industry

  • “International Mergers: Working across Multiple Jurisdictions,” Global Antitrust Economics Conference, Concurrences Review and Northwestern University, 7 October 2016
  • “Choosing and Hiring an Economic Expert,” Fordham Competition Law Institute 2016, 21 September 2016
  • 2nd Competition and IP Policy in High-Technology Industries Conference, Cornerstone Research and the Stanford Institute for Economic Policy Research (SIEPR), 19 April 2016
  • “Applying Advanced Empirical Methods,” 42nd Annual Conference on International Antitrust Law and Policy, Fordham University School of Law, 30 September 2015