Jeff Knox, former head of the U.S. DOJ Fraud Section, is Co-Managing Partner of Simpson Thacher’s Washington, D.C. office and Global Co-Head of the Firm’s Government and Internal Investigations Practice. A fellow of the Litigation Counsel of American and a board member of Northwestern University Pritzker School of Law, Jeff represents multinational corporations and independent board committees in high-stakes investigations by the DOJ, SEC, OFAC, State AGs, and other federal and state enforcement regulators. He has advised some of the world’s leading financial services firms, energy companies, life sciences companies, and technology firms in navigating criminal and civil investigations relating to the FCPA, securities and accounting fraud, market manipulation, False Claims Act, trade controls, antitrust, international money laundering, economic sanctions, and environmental crimes. Jeff also represents senior executives, in their individual capacity, who are subjects of enforcement investigations. Jeff has served as a government-appointed independent compliance consultant, and represents companies in government and court-mandated monitorships. Prior to joining the Firm, Jeff served as a federal prosecutor for more than a decade, including as the Chief of the DOJ’s Fraud Section in Washington, D.C., and before then, as the Chief of the National Security Section of the U.S. Attorney’s Office for the Eastern District of New York.
Jeff is recognized as a Band 1 FCPA lawyer by Chambers USA and Chambers Global, and as a “Leading Lawyer” by The Legal 500. Jeff has been named a White Collar MVP by Law360, and is consistently recognized by Chambers, The Legal 500 and Euromoney’s Benchmark Litigation, where sources note him as “one of the best lawyers in the country,” “brilliant with an incredible depth of knowledge,” and “a master strategist with a unique insight into the way the DOJ works.” He is a respected voice on corporate compliance and enforcement policy, and served on advisory boards dedicated to these issues at NYU School of Law and the American Law Institute.
Updated Oct 2025
