Arianna R. Berg

Arianna is a litigator with a proven track record in managing complex litigation. A former federal prosecutor with Fortune 35 corporate legal experience, Arianna is a skilled courtroom communicator, with a depth of knowledge that includes compliance litigation and investigations and an ability to drive consensus in challenging environments that require initiative and solid judgment.

Before coming to Shook, Arianna was an associate general counsel, special investigations, and registered in-house counsel at Meta Platforms, Inc. She led Meta’s complex internal investigations on global matters relating to compliance, cybersecurity, privacy, financial fraud, whistleblowers, employment retaliation, and other areas implicating potential criminal, regulatory, litigation or reputational risk. In this role, she responded to federal government inquiries and subpoenas, and managed document-intensive responses. Arianna developed and drafted investigative plans, findings memoranda, and conducted a high volume of witness interviews and forensic analysis.  

Earlier in her career, Arianna served as a federal prosecutor in the criminal divisions for U.S. Attorneys’ Offices on two coasts. As an assistant U.S. attorney in the Northern District of California, Arianna led investigation and prosecution of complex transnational criminal cases, which required extensive cross-functional collaboration with various federal and local law enforcement agencies and counsel. As assistant U.S. attorney for the Southern District of New York, Arianna investigated and prosecuted nearly 200 criminal defendants in a broad range of federal crimes, including fraud and cybersecurity, and served as lead trial counsel in several federal trials, as well as briefed and argued cases before the U.S. Court of Appeals for the Second Circuit.

Arianna has also worked in a global law firm as a litigation associate, representing corporate and individual clients in multidistrict litigation, federal white collar investigations, health insurance and intellectual property matters.

Arianna earned her J.D. from Georgetown University Law Center, where she was a member of the American Criminal Law Review and served as a judicial intern for the U.N. International Criminal Tribunal for the Former Yugoslavia, The Hague, Netherlands. Arianna earned a B.A. cum laude from Northwestern University, studied a semester at the Université Paris-Sorbonne and served in a Fulbright Scholarship in Budapest, Hungary. Upon graduation from law school, Arianna served in a clerkship to the Honorable Thomas C. Platt in the U.S. District Court for the Eastern District of New York, where she researched and drafted memoranda and and advised the judge.