Mahr is a former director of litigation in the Justice Department’s antitrust division, which along with eight states sued Google on Tuesday. The company confirmed Mahr is its lead outside lawyer in the case.
He joined Freshfields as a partner in 2018 after spending nearly two years at Justice. At the law firm he represented Google in another antitrust case filed by more than a dozen US state attorneys general accusing the company of having a monopoly on the technology that underpins online advertising.
Freshfields and Mahr didn’t immediately respond to requests for comment.
Mahr is co-chair of the firm’s antitrust group. He previously was an antitrust partner at Wilmer Cutler Pickering Hale and Dorr in Washington, where he represented clients including Intel Corp.
He is now a managing partner of Freshfields’ office in Washington and a member of the London-based legal giant’s global board. In recent years Freshfields has sought to grow its US practice offerings, including expanding its antitrust expertise.
In 2019, Freshfields recruited former Cleary Gottlieb Steen & Hamilton corporate partner Ethan Klinsberg, who advised Google in 2014 on the $2.9 billion sale of its Motorola Mobility unit to Lenovo Group Ltd.