Sonja Arndt‑Johnson is a Special Counsel and the San Francisco Administrative Chair of the Firm’s Litigation Practice Group, as well as a member of the Firm’s Privacy & Data Security Practice Group. She brings more than four years of private practice experience, following her tenure with the U.S. Department of Justice (DoJ) in Washington, D.C. While at the DoJ, Mrs. Arndt-Johnson served in the U.S. Attorney’s Office for the District of Columbia, the Office of International Affairs (OIA), and the Computer Crime and Intellectual Property Section (CCIPS). Prior to joining the DoJ, Mrs. Arndt-Johnson was a line prosecutor at Santa Clara County District Attorney’s Office.
Mrs. Arndt-Johnson is an efficient litigator who moves thoroughly and quickly through investigations, providing quick resolutions for civil and criminal matters. She has extensive experience handling complex litigation, conducting internal investigations, and navigating high-stakes negotiations with both private and government entities—including the DoJ, SEC, IRS, FTC, DoD, CA State AG, local CA district attorney offices, and the IMF’s Office of Internal Investigations. She has managed public-facing crisis communications and overseen all phases of state and federal cases, bringing more than a dozen trials to verdict. She also advises companies of all sizes on data privacy compliance and breach response, and previously completed a secondment at a Fortune 500 company. Having represented dozens of individuals and corporations in matters involving fraud, money laundering, qui tam actions (including, but not limited to, the corporate practice of medicine and kickbacks allegations), criminal and civil RICO, CPRA/CCPA, BIPA, and wiretap allegations, Mrs. Arndt-Johnson is a straight shooter who fights for her clients.