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Dr. Ben-Ishai has extensive expertise in competition, securities, and product liability matters.

Prior to joining The Brattle Group, he completed three years of distinguished public service as a senior government official and the Chief Economist at the New York State’s Attorney General’s Office. As Chief Economist for the Office, Dr. Ben-Ishai successfully led the economics work of the agency in a number of high-stakes, high-impact cases. These include a consummated merger challenge where he testified on disgorgement of ill-gotten gains; a product hopping monopolization lawsuit in the pharmaceutical industry; a securities investigation involving climate change risk disclosure; and a consumer fraud matter related to the sales of diesel vehicles equipped with defeat devices.

Earlier in his career, Dr. Ben-Ishai served as a private consultant in both testifying and consulting roles. He advised clients on a wide range of antitrust matters relating to monopolization, price-fixing conspiracies, mergers, and damages. He was also a Visiting Fellow at the Milken Institute in California and a Visiting Scholar at the University of Toulouse in France.

Representative Engagements
New York State v. PricewaterhouseCoopers LLP and Exxon Mobil Corp.
Provided consulting support on economic materiality in an investigation relating to Exxon’s climate change related disclosures (March 2016 to Present)
In the matter of Comcast Corp. and Time Warner Cable Inc.
Advised the State of New York on the competitive impact of a proposed acquisition of Time Warner Cable by Comcast Corporation (January 2015 to April 2015)
New York State v. Maurice Greenberg and Howard Smith
Provided consulting support related to disgorgement of ill-gotten gains in a matter relating to alleged AIG investor fraud (March 2016 to Present)
In the matter of Peabody Energy Corp.
Provided consulting support in an investigation of alleged misstatements made by Peabody Energy relating to its climate change risks (October 2014 to November 2015)
New York State v. Actavis PLC
Served as a consulting expert in a monopolization case relating to a pharmaceutical product hopping strategy (April 2014 to November 2015)
Expressions Hair Design, et al., v. Eric Schneiderman

Provided consulting support in connection with pricing and surcharging of credit card merchant fees for a U.S. Supreme Court Case brought against the State of New York 

United States et al., v. Anthem Inc. and Cigna Corp.
Advised the State of New York on the competitive impact of a proposed acquisition of Cigna by Anthem (October 2016 to Present)
Testimony
United States et al., v. Twin America LLC et al., United States District Court, Southern District of New York, Case No. 12-cv-8989 (ALC), Provided expert reports and deposition testimony in support of the government’s claims relating in an unlawful merger between tour companies operating in New York State; testified on disgorgement of ill-gotten gains attributed to the merger.
March, April 2017
In re NCAA Student-Athlete Name & Likeness Licensing Litigation, United States District Court, Northern District of California, Case No. 09-cv-01967 CW, Provided an expert report and deposition testimony for defendants in a matter involving an alleged conspiracy to fix compensation of NCAA student-athletes

March to September 2013
Publications
News & Events
June 11, 2019
Guy Ben-Ishai Participated in an International Antitrust Conference Held at Tel Aviv University

Brattle Principal Guy Ben-Ishai recently spoke on a panel at the Antitrust New Frontiers: The Digital Economy and Economic Concentration Conference, which took place on June 11–12 at Tel Aviv University.

May 20, 2019
Brattle Economists Examine the Use of the Sherman Act to Address Alleged Market Manipulation

Brattle Principals Shaun Ledgerwood, Jeremy Verlinda, and Guy Ben-Ishai, and Director of Global Development James Keyte have co-authored an article in the Energy Law Journal in which they address whether the use of antitrust laws, specifically Section 2 of the Sherman Act, to address alleged market manipulation makes sense from an economic perspective.

December 05, 2018
Guy Ben-Ishai Presented at the CBA Antitrust in the Labor Market Teleconference

Brattle Principal Guy Ben-Ishai spoke at the Canadian Bar Association (CBA) Antitrust in the Labor Market Teleconference, which was held December 5.

January 19, 2018
The Brattle Group Introduces Its Newest Experts

The Brattle Group is pleased to introduce the seven exceptional experts who became Brattle principals over the past year.

January 19, 2018
The Brattle Group Recognized as one of the World's Top Firms for Competition Economics by Global Competition Review

For the 11th consecutive year, The Brattle Group has been named one of the world’s top firms for competition economics by Global Competition Review (GCR).

October 26, 2017
Guy Ben-Ishai to Participate in The Knowledge Group Webinar on Reverse Payment Settlements

Brattle Principal Guy Ben-Ishai will present during The Knowledge Group’s webinar, “Reverse Payment Settlements: Trends & Updates in 2017 & Beyond,” taking place October 26, 2017 from 12-2 pm EST.

July 12, 2017
New York Attorney General’s Chief Economist Guy Ben-Ishai Joins The Brattle Group

The Brattle Group is pleased to announce that competition and securities expert Dr. Guy Ben-Ishai has joined the firm’s New York office as a principal.