United States: Sonia Pfaffenroth Rejoins Arnold & Porter
Last Updated: May 22 2017

The Antitrust team at Arnold & Porter Kaye Scholer is pleased to welcome Sonia Pfaffenroth back to the firm. She will rejoin the team as a partner in September.

Sonia most recently served as former Deputy Assistant Attorney General for Civil and Criminal Operations for the Antitrust Division at the US Department of Justice. In that role, she supervised both civil and criminal enforcement efforts as well as the Division's legal policy and international sections.

She oversaw a number of the Division's most significant matters, including the Division's challenge to the Anthem/Cigna and Aetna/Humana mergers and the American Express litigation. She also worked closely with the Foreign Commerce Section on the Division's international program and with the Legal Policy Section on competition advocacy efforts.

Sonia previously served as Deputy Assistant Attorney General for Civil Enforcement at the Antitrust Division and Chief of Staff to Bill Baer, former Assistant Attorney General for Antitrust, who recently announced that he will rejoin Arnold & Porter Kaye Scholer on June 1.

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