Kostis Hatzitaskos

Vice President


  • Chicago


Kostis Hatzitaskos coheads Cornerstone Research’s antitrust and competition practice. Citing his econometrics expertise and significant experience analyzing large datasets, Who’s Who Legal has recognized Dr. Hatzitaskos as a Future Leader in the competition field, describing him as “a great young economist, great communicator, and a pleasure to work with.”

Dr. Hatzitaskos leads merger review teams for merging parties and government agencies in investigations, both in the United States and internationally. He has extensive experience in all phases of merger review, including lead trial roles on behalf of the government on U.S. v. Aetna/Humana and FTC v. Wilhelmsen/Drew, and on behalf of the merging parties in T-Mobile/Sprint and FTC v. Sysco/U.S. Foods.

His civil litigation experience involves class certification, liability, and damages issues in complex commercial litigation across competition and 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.

Dr. Hatzitaskos has coauthored multiple publications on 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. A regular speaker and moderator at specialist and scholarly conferences, Dr. Hatzitaskos has participated in panels at Stanford, Fordham, Northwestern, and George Washington Universities. As of 2018, he is a member of the editorial board of the ABA’s Antitrust Source.

Press Release

WWL: Global Leader Competition—Economists 2022

Press Release

Craig Malam Joins Cornerstone Research

Press Release

Cornerstone Research Staff and Affiliated Experts Submit Comments to the Joint FTC-DOJ Inquiry on Merger Enforcement


Meta/Kustomer Merger

Press Release

Cornerstone Research Named in 2022 Matters of the Year in U.S. and Europe

Press Release

2022 Antitrust Writing Awards

Press Release

2021 Who’s Who Legal: Consulting Experts


A Tale of Two Sides: Sabre/Farelogix in the United States and the U.K.

  • “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