Anthony Lewis

Anthony Lewis is Co-Head of Sullivan & Cromwell’s National Security Practice, a member of the Firm’s Criminal Defense and Investigations Group, and Co-Head of the Firm’s Cybersecurity Practice. His practice focuses on international and government investigations and on cybersecurity incident response and advice.

A former supervisor in the National Security Division of the U.S. Attorney’s Office for the Central District of California, Mr. Lewis has extensive experience with matters involving economic and financial crime, sanctions, technology transfer and export controls, cryptocurrencies, cybercrime, counterintelligence and other areas that implicate national security concerns for corporate clients and financial institutions. Mr. Lewis has represented clients in internal investigations and regulatory enforcement proceedings, including with the Department of Justice (DOJ), the Securities and Exchange Commission (SEC), the Office of Foreign Assets Control (OFAC), and the Commodity Futures Trading Commission (CFTC), and with financial regulators. He has advised clients in a wide range of industries, including aerospace and defense, technology, industrials, financial services and consumer goods.

Widely recognized for his work in counterintelligence, cybersecurity, and defense, Mr. Lewis received the Attorney General’s Award for Distinguished Service twice as well as recognition from the U.S. Intelligence Community. He was also named to Cybersecurity Docket’s “Incident Response 50” for a third consecutive year, a list which honors the 50 “best data breach response lawyers in the country” and has been recognized by Lawdragon as one of the “500 Leading Litigators in America” and one of the “500 Leading Global Cyber Lawyers.”

Mr. Lewis previously served on Law360’s Aerospace & Defense Editorial Advisory Board. Since 2021, he has been a member of the Criminal Justice Act Panel for the Central District of California.