Sonia Kuester Pfaffenroth

Partner, Arnold & Porter.  Sonia represents clients in merger and cartel investigations, private litigation and day-to-day counseling.  She rejoined the firm in 2017 from the Antitrust Division of the Department of Justice, where she served as the Deputy Assistant Attorney General (DAAG) for Civil and Criminal Operations.  She previously served as DAAG for Civil Enforcement, Chief of Staff and Senior Counsel.  Prior to government service, she practiced at Arnold & Porter for eight years.