Guillermo Christensen


Guillermo Christensen is a partner in the DC office of Ice Miller LLP and practices in the Data Security and Privacy and White Collar groups. Before becoming a lawyer, Guillermo served as an intelligence officer with the CIA and a diplomat with the Department of State.  He had multiple international and domestic assignments including with the FBI post-9/11 and the predecessor to the National Counterterrorism Center.  Most recently, Mr. Christensen served as the Science and Technology Advisor to the U.S. Mission to the OECD in Paris, France, where he was responsible for cybersecurity, internet governance, cross-border data flows, and intellectual property rights.  From 2001-2002, Mr. Christensen was the CIA Fellow at the Council on Foreign Relations in New York. 


In his legal practice, Guillermo advises clients on enterprise-level risks, primarily cyber and national security, trying to keep clients “left of boom” through pre-incident risk assessments, but also managing their “right of boom” situations (breaches), in particular nation-state attacks.  He conducts internal investigations into insider threats and allegations of violations of international trade and national security laws and has worked in places such as Northern Iraq, Burma, Malaysia, numerous countries in Africa. Asia, and all of Latin America.  Drawing on his national security experience he assists clients in national security reviews of foreign acquisitions through the CFIUS/Treasury Department process.  He currently serves on the international advisory board of the Reeves Center at the College of William and Mary and is a life member of the Council on Foreign Relations.  Guillermo is a frequent speaker and writer on cybersecurity and national security issues, including on topics such as nation state hackers, “deep fakes,” and advanced persistent threats.  He recently has keynoted discussion on Fintech and E-Commerce at major conferences in Qatar and Mexico. Guillermo was born in Argentina and grew up in South Africa before emigrating to the United States.  He studied at The American University (BA) and Georgetown (MSFS and JD).