Lexology Index 2025: Cornerstone Research Competition Experts Honored as Global and Elite Thought Leaders

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Eight academic experts and five consulting professionals are recognized among the foremost competition economists in the world.

The Lexology Index: Competition, in collaboration with Global Competition Review, each year recommends “the best consultants, expert witnesses and advisers in the world,” highlighting their expertise and the valuable testimony they provide to lawyers and clients in complex antitrust matters.

In addition, five individuals were named by Lexology Index to its 2025 list of Global Elite Thought Leaders. Considered “at the peak of their profession,” these leaders “are worthy of special mention … [for] their ability to innovate, inspire, and go above and beyond to deliver for their clients.”

Academic experts

Consulting professionals

The individuals featured in these annual lists received the most nominations from peers, corporate counsel, and other market sources during Lexology’s latest research cycle, a testament to their expertise and leadership in the competition field.

Juan Delgado

Juan Delgado

Lecturer, Universidad Carlos III, Madrid;
Former Chief Economist, Comisión Nacional de los Mercados y la Competencia (CNMC), Spain;
Managing Director, GAMES Economics

Kenneth G. Elzinga

Kenneth G. Elzinga

Robert C. Taylor Professor of Economics,
University of Virginia;
Senior Advisor, Cornerstone Research

Gautam Gowrisankaran

Gautam Gowrisankaran

Professor of Economics,
Columbia University;
Senior Advisor, Cornerstone Research

Esteban Greco

Esteban Greco

Former President, Comisión Nacional de Defensa de la Competencia (CNDC), Argentina;
Director, GAMES Economics

C. Scott Hemphill

C. Scott Hemphill

Moses H. Grossman Professor of Law,
School of Law, New York University

Ariel Pakes

Ariel Pakes

Thomas Professor of Economics,
Harvard University;
Senior Advisor, Cornerstone Research

Peter C. Reiss

Peter C. Reiss

MBA Class of 1963 Professor of Economics, Emeritus
Stanford Graduate School of Business;
Senior Advisor, Cornerstone Research

Gregory L. Rosston

Gregory L. Rosston

Gordon Cain Senior Fellow,
Stanford Institute for Economic Policy Research (SIEPR);
Director, Stanford Public Policy Program;
Professor of Economics (by courtesy),
Stanford University

Liam Colley
  • Location icon London
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Liam Colley

Senior Vice President

Vandy M. Howell
  • Location icon San Francisco
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Vandy M. Howell

Senior Advisor

Gregor Langus
  • Location icon Brussels
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Gregor Langus

Vice President*

Bryan M. Ricchetti
  • Location icon Chicago
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Bryan M. Ricchetti

Senior Vice President

Joanna Tsai
  • Location icon Washington
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Joanna Tsai

Vice President