FacultyFaculty/Author Profile
Sonia K. Pfaffenroth

Sonia K. Pfaffenroth

Arnold & Porter

Washington, DC, USA


Sonia Kuester Pfaffenroth rejoined Arnold & Porter in 2017 from the Antitrust Division of the US Department of Justice (DOJ) where she served most recently as Deputy Assistant Attorney General for Civil and Criminal Operations. In that role, Ms. Pfaffenroth was responsible for supervising both civil and criminal antitrust enforcement efforts, as well as the Division's work with antitrust and competition law enforcement agencies worldwide.

While at the DOJ, Ms. Pfaffenroth oversaw a number of the Division's most significant matters, including the Division's challenges to the Anthem/Cigna and Aetna/Humana mergers and the American Express litigation. In addition to her responsibilities with respect to the Division's international program, she also supervised a broad range of legal policy initiatives and competition advocacy efforts. She previously served as Deputy Assistant Attorney General for Civil Enforcement at the Antitrust Division and Chief of Staff and Senior Counsel to former Assistant Attorney General for Antitrust Bill Baer.

Before leaving to join the DOJ in 2013, Ms. Pfaffenroth was a partner at the firm, where she represented companies in a range of industries in international cartel investigations, merger and acquisition reviews and civil antitrust litigation, as well as providing day-to-day antitrust counseling.

Ms. Pfaffenroth originally joined Arnold & Porter in 2005 after clerking for Judge Paul Friedman of the US District Court for the District of Columbia.

Sonia K. Pfaffenroth is associated with the following items:
CHB Chapters  CHB Chapters Horizontal Merger Guidelines, U.S. Department of Justice and the Federal Trade Commission (August 19, 2010) - Hot Topics in Mergers & Acquisitions 2018, Friday, September 14, 2018
US & EU Competition Law—Merger Enforcement: 2017 Year in Review (February 28, 2018) - Hot Topics in Mergers & Acquisitions 2018, Friday, September 14, 2018
FTC Approves Northrop Grumman’s Acquisition of Orbital ATK with Behavioral Conditions (June 13, 2018) - Hot Topics in Mergers & Acquisitions 2018, Friday, September 14, 2018
Web Segment  Web Segment Regulatory Issues for the M&A Lawyer - Hot Topics in Mergers & Acquisitions 2018, Friday, October 12, 2018
MP3 Audio  MP3 Audio Regulatory Issues for the M&A Lawyer - Regulatory Issues for the M&A Lawyer, Friday, October 12, 2018
Transcripts  Transcripts Regulatory Issues for the M&A Lawyer - Regulatory Issues for the M&A Lawyer, Friday, October 12, 2018
MP4 - Mobile Video Seg  MP4 - Mobile Video Seg Regulatory Issues for the M&A Lawyer - Regulatory Issues for the M&A Lawyer, Friday, October 12, 2018
On-Demand Web Programs  On-Demand Web Programs Hot Topics in Mergers & Acquisitions 2018, Wednesday, October 17, 2018, New York, NY
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