Sonja Arndt-Johnson is a Special Counsel at Buchalter and a member of the firm’s Privacy & Data Security and Administrative Chair of the White Collar & Investigations practice groups. She also serves as the San Francisco Office’s Administrative Litigation Chair. A former federal and local prosecutor, congressional advisor, and Fortune 500 secondee, she advises companies, executives, and individuals facing government investigations, regulatory enforcement actions, cybersecurity incidents, privacy matters, and other high-stakes disputes.
Drawing on experience with the U.S. Department of Justice—including the U.S. Attorney’s Office for the District of Columbia, the Office of International Affairs, and the Computer Crime and Intellectual Property Section—as well as the Santa Clara County District Attorney’s Office, Ms. Arndt-Johnson provides strategic counsel at the intersection of legal, business, and reputational risk. Before entering the legal profession, she advised Members of Congress on foreign affairs, national security, military, and veterans affairs issues, providing her with a unique perspective on the governmental and geopolitical dynamics that shape complex matters.
Clients value her strategic judgment, discretion, and practical, business-focused approach to matters with significant legal, financial, and reputational consequences.
Ms. Arndt- Johnson has received a number of prestigious awards, including:
- “Top 500 Leading Global Investigations Lawyer,” Lawdragon
- “Top 40 Under 40,” Daily Journal