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David A. Simon

David A. Simon

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Staying Ahead of the Curve: Cybersecurity and Data Privacy–Hot Topics for Global Businesses


Cybersecurity Book

David Simon is a partner in Mayer Brown's Washington DC office and a member of the global Cybersecurity & Data Privacy practice. He is also a member of the firm's National Security and Government Contracts practices.

A former special counsel at the US Department of Defense (DoD), David has advised extensively on cutting-edge cybersecurity and national security matters. David focuses his practice on complex and sensitive cybersecurity, defense, intelligence and national security matters, with deep experience advising victims of state-sponsored cyber activity. He advises companies as they address cyber vulnerabilities and breaches, as well as associated legal, regulatory, and reputational consequences. In addition, David helps companies structure, negotiate and protect their commercial and compliance relationships with key national security government agencies. He also counsels US and foreign clients regarding economic sanctions, asset controls and transactions reviewed by the Committee on Foreign Investment in the United States (CFIUS).

During his time in the Pentagon (2011-2015), David served as special counsel to the DoD general counsel. In that capacity, he advised on matters involving cybersecurity policy, plans and operations, as well as autonomous technologies, the use of force, counterterrorism, treaties and sensitive investigations.

David is widely recognized for his experience regarding the legal and policy issues at the intersection of cybersecurity, autonomous technologies, and national security. He is an Adjunct Fellow in Cybersecurity and International Law at the Center for Strategic and International Studies (CSIS), where he served as a member of a Cyber Policy Task Force that developed cybersecurity recommendations for the 45th presidential administration. Currently, David also serves as an independent legal expert and member of the Advisory Group to the United Nations Counter-Terrorism Executive Directorate initiative to prevent terrorist use of the Internet and related information communications technologies. Recently, he served as an independent legal expert to the United Nations in support of its Group of Governmental Experts on cybersecurity. David also served, at the invitation of the NATO Cooperative Cyber Defense Center of Excellence in Tallinn, Estonia, as a peer reviewer of the second edition of the “Tallinn Manual on the International Law Applicable to Cyber Warfare.” He is a term member of the Council on Foreign Relations.

A Rhodes Scholar and Truman Scholar, David graduated from Harvard Law School, where he was an executive editor of the Harvard Civil Rights-Civil Liberties Law Review and a Heyman Fellow. Prior to attending law school, he received an M.Phil. in International Relations from Trinity College, Oxford, where he debated for the Oxford Union and was the managing editor of the Oxford International Review. David graduated summa cum laude and Phi Beta Kappa from the University of Minnesota, where he received a BA in Russian Area Studies.

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