Andrew Tannenbaum

Andrew Tannenbaum is a Partner and Global Co-Head of Cybersecurity at A&O Shearman, where he advises clients on cybersecurity, AI, and data privacy matters.  

Prior to joining A&O Shearman, Andrew was General Counsel of Barclays Execution Services, where he led global legal teams for the Barclays Group over all technology and operations areas, including cybersecurity, AI, data, emerging tech, intellectual property, operational resilience, and crisis management.  Andrew was also IBM's first Chief Cybersecurity Counsel, a role in which he founded one of the earliest corporate global cyber legal teams. 

Prior to his time at IBM, Andrew served in the government for 10 years during both the Obama and Bush administrations, most recently as Deputy General Counsel of the National Security Agency. Andrew also served as Deputy Director of the Guantanamo Review Task Force, Senior Counselor and Assistant General Counsel in the White House Office of Management and Budget, Counsel to the Assistant Attorney General for National Security, Attorney-Advisor in the Office of Legal Counsel, and Trial Attorney in the Justice Department's Civil Division.

Andrew started his career as a litigator at Davis Polk & Wardwell and clerked for Judge Wilfred Feinberg of the United States Court of Appeals for the Second Circuit.

Andrew is a graduate of Columbia Law School ('00), where he was a James Kent Scholar and an editor of the Columbia Law Review, and Dartmouth College.