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Guillermo Christensen is a partner in Ice Miller’s Data Security and Privacy and White Collar Defense Groups. Guillermo combines his experience as an attorney, a former CIA intelligence officer and a diplomat with the U.S. Department of State to shape and inform the advice he provides to clients on various enterprise risks involving cybersecurity and national security law. His cybersecurity experience ranges from conducting information security risk assessments that take a “whole of company” approach to managing responses to security incidents and breaches, including those where a nation-state or insider threat may be involved. Guillermo also counsels clients in managing national security reviews through the Committee on Foreign Investment in the United States (CFIUS), particularly those involving high-technology and critical infrastructure sectors.
In the international trade area, Guillermo regularly represents clients in complying with anti-corruption laws such as the Foreign Corrupt Practices Act (FCPA) and economic sanctions and embargoes administered by the Office of Foreign Assets Controls (OFAC). His work includes handling cross-border investigations, compliance reviews and pre-acquisition diligence. He has investigated matters in South America, Africa, Asia and the Middle East involving companies operating in the energy, high-technology, defense and transportation sectors. He also advises companies on the adequacy of internal controls and compliance policies and has set up compliance programs from the ground up for companies expanding into international markets, including training programs and board-level market entry advice.
Guillermo previously worked in the Washington, D.C. offices of two international law firms.
Prior to becoming a lawyer, Guillermo served as an intelligence officer with the CIA for 15 years in a variety of domestic and international assignments. His experiences included inter-agency roles with the Departments of Defense and State, the FBI and several national intelligence fusion centers. In 2001, Guillermo was selected by the CIA Director to serve as the National Intelligence Fellow to the Council on Foreign Relations in New York, a position designated for an officer on the cusp of senior leadership within the US intelligence community.
Guillermo subsequently returned to public service in 2010-2011 as the Science and Technology Advisor to the U.S. Mission to the Organization for Economic Cooperation and Development (OECD) in Paris.  There, Guillermo was responsible for managing and conceptualizing U.S. policy in the areas of technology, telecommunications, privacy and science at the OECD. He advocated for U.S. interests across a range of technology issues, such as cybersecurity, data privacy, cloud computing, cross-border data flows and intellectual property.  
Guillermo earned his juris doctor in 2005 from the Georgetown University Law Center while working at the CIA. His law school education included participation in a joint GULC-University College of London program on EU and European Law Program. He was also a senior member of the Georgetown Journal of International Law. Guillermo received his Bachelor of Arts in International Relations in 1988 from American University and earned his master’s degree in Foreign Service from Georgetown University’s School of Foreign Service.
Guillermo remains active in a number of national security related areas, including as a life member of the Council on Foreign Relations and as a participant in the U.S. Department of State’s Speaker’s Bureau.  He is a member of the Sedona Conference and has contributed to WG6 and WG11 projects on data security and ephemeral messaging and law enforcement. He is a frequent speaker and moderator on national security and cybersecurity topics in the U.S. and internationally and is a current member of the Law360 Editorial Board on Cybersecurity.
Guillermo is licensed to practice law in the District of Columbia, New York and Virginia.
Firm Publications
Blog Posts
Published In
  • "UK Litigation and Guidance Highlight Cybersecurity Risk," Law360, January 10, 2019
  • “How Cellphone Chips Became a National-Security Concern,” WJS, March 2018
  • “Broadcom’s Deal for Qualcomm is in Serious Jeopardy, and It Might Have to Abandon Its Bid and Come Back Later, CNBC, March 2018
  • “For Equifax’s Legal Team, Breach Likely to Bring Litigation Challenges, High Price Tag,”, September 2017
  • “Law360 Privacy/Consumer Protection Editorial Advisory Board,” Law360, March 2017
  • “As Hacking Incidents Rise, Cybersecurity to Remain a Priority under Trump,” The Street, November 2016
Speaking Engagements
  • Keynote – “Private-Public Sector Cybersecurity Cooperation” – Qatar National Bank 5th Annual Cybersecurity Forum, Doha, November 2018.
  • Speaker – “Cybersecurity Fundamentals for Companies” – Overseas Security Advisory Committee, Doha, November 2018.
  • Speaker – “Spycraft and the Hacker Mindset” – DRI Cybersecurity Conference, Chicago, September, 2018.
  • Speaker – “International Cooperation in Corruption Investigations, Buenos Aires, Argentina.
  • Speaker – “Legal Privilege in Cross-Border Investigations,” Corporate Parity 3rd Annual Anti-Corruption Conference, Amsterdam May 2018.
  • Speaker – “Spy Craft: Nation-state Cyber Threats and Managing Enterprise Risks,” Hispanic National Bar Association Corporate Counsel Conference, March 2018
  • Speaker – “Fireside Chat on Cybersecurity and Global Risks,” Control Risks RiskMap 2018 Conference, January 2018
  • Moderator – “Protecting Attorney Client Privilege During a Data Breach Investigation,” Insecurity 2017 Conference, November 2017
  • Moderator and Speaker – “Cyber Breaches: What General Counsels Need to Know About Detection and Response,” Brown Rudnick Cyber Conference, November 2017
  • Speaker – “Cybersecurity: What Compliance Officers Need to Know,” Houston Compliance Counsel Exchange, October 2017
  • Panelist – “Cybersecurity Risk and Insurance,” Hispanic National Bar Association Annual Convention, September 2017
  • “Law Firms and Data Security,” Sedona Conference Working Group 11, September 2017
  • Panelist  – ABA Section of International Law, Data Security in the Panama Paper Context, April 2017
  • Speaker – “China’s New Cybersecurity Law,” SINET ITSEF Palo Alto Conference, March 2017
  • Panelist – “Law Firm Data Security,” Sedona Conference Working Group 11, January 2017
  • Speaker – “Cybersecurity Threats to Critical Infrastructure,” St. John’s University School of Risk Management, November 2016
  • Speaker – “Cybersecurity Challenges to Public Utilities,” Conference for the American Public Power Association, October 2016
  • Speaker – St. John’s University Conference on Geopolitical Risk and Cybersecurity, October 2015
  • Moderator – Closing Plenary Panel on Technology, Council on Foreign Relations Conference on Diversity in International Relations, 2014
  • Presenter – “Cyber Crimes, Ethics & Social Media,” Hispanic National Bar Annual Conference, September 2013
  • Moderator – “Forecasting the Future: Social Media as an Intelligence Tool,” Council on Foreign Relations, February 2012
  • Speaker – “Data Governance and US Policy,” IBM Data Governance Conference, Talleyrand Center, 2011
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