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Guillermo Christensen is a partner in the White Collar Defense & Government Investigation Group and Chair of the Cybersecurity and Data Privacy Practice at Brown Rudnick. Guillermo advises multinational corporate clients on various enterprise risks involving information systems security and data security ("cybersecurity") and insider threats to corporate systems. He has conducted confidential internal investigations relating to cybersecurity incidents, allegations of foreign corruption, and violations of export controls and economic sanctions. Guillermo regularly represents clients seeking to secure approvals from the Committee on Foreign Investment in the U.S. (CFIUS) for acquisitions of U.S. businesses by foreign buyers involving national security issues. In all these areas, Guillermo brings a wealth of international business, intelligence, and national security experience to his practices and provides his clients with broader perspectives for troubleshooting complex and unusual problems.
In the government, Guillermo was a CIA intelligence officer and a diplomat with the U.S. State Department. From 2001 to 2002, he was also the CIA Fellow to the Council on Foreign Relations in New York, an intelligence community position designated for officers on the cusp of the most senior responsibilities. From 2002 to 2004, Guillermo was on loan from the CIA to the FBI and to a national counterterrorism fusion center to help improve intelligence collection and analysis of emerging threats. He most recently served in a policy role as the Science and Technology Advisor to the U.S. Mission to the Organization for Economic Cooperation and Development (OECD) in Paris, where he led multi-stakeholder policy reviews of encryption, cybersecurity and cross-border data flows.
In private practice, Guillermo has worked on a variety of complex international matters—including FCPA and OFAC investigation and dual use and high-technology exports. He has served clients across the financial, technology, energy and defense sectors, and has worked on matters in the Middle East, Latin America, Asia, Europe and Africa.
In the cybersecurity field, Guillermo is a thought leader on the topics of intelligence collection, counter-measures, business opportunities for emerging companies, and corporate governance. Building upon his experience in the intelligence and national security realms his focus is on helping clients integrate information and network security practices into their enterprise risk process, and facilitating companies’ adaptation to technical and human (insider) threats and system vulnerabilities. When breaches or insider threats are suspected, Guillermo leads Brown Rudnick’s multidisciplinary team to carry out investigations, manage crises, and assist clients in the remediation process. Guillermo also frequently speaks on cybersecurity topics to audiences nationwide – he is currently involved in drafting a Sedona Conference Working Group 11 project on data security for law firms.
Guillermo is active with several prominent organizations including as a life member of the Council on Foreign Relations, where he serves on the selection committee for the International Affairs Fellowship. He also serves on the Advisory Board of the Reves Center for International Studies at the College of William and Mary. He was a 2016 Fellow of the Leadership Council on Legal Diversity (LCLD).
Cybersecurity and Data Privacy
Corporate Investigations and FCPA Compliance
Regulatory and National Security Law
International Arbitration and Complex Business Litigation
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