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Cyril (Cy) Brennan focuses his practice on international trade regulation and compliance, with an emphasis on U.S. export controls and economic sanctions. Cy handles matters regarding the International Traffic in Arms Regulations (ITAR), the Export Administration Regulations (EAR), U.S. sanctions programs administered by the Treasury Department’s Office of Foreign Assets Control (OFAC) and the Department of Commerce’s anti-boycott regulations. In addition, he represents clients before the Committee on Foreign Investment in the United States (CFIUS), and advises clients on the Foreign Corrupt Practices Act (FCPA), the foreign direct investment reporting requirements of the Bureau of Economic Analysis (BEA), and other trade and investment-related regulations in the context of mergers and acquisitions.


  • Export controls and economic sanctions
  • Committee on Foreign Investment in the United States (CFIUS)
  • Anticorruption compliance
  • Foreign direct investment reporting
  • Regulatory due diligence
  • Foreign ownership, control or influence (FOCI)



  • Represented Carrick Capital Partners in connection with its Series B Investment in Bishop Fox. Bishop Fox provides offensive security solutions ranging from continuous penetration testing, red teaming, and attack surface management to product, cloud and application security assessments.
  • Represented Crestview Partners in connection with the acquisition of Emerald EMS, an electronics manufacturing services provider specializing in high-mix, low-volume engineering, design, prototyping, testing, assembly and lifecycle support services for blue-chip original equipment manufacturers across a range of end markets.

Recognition & Leadership

  • Listed, Latin Lawyer, "Latin Lawyer 250 - Practice Recognition: Anti-Corruption Investigations and Compliance," 2020-2024
  • Team Member, National Law Journal, “Washington, D.C. Litigation Department of the Year - White Collar Defense & Special Investigations,” 2022
  • Team Member, "Corporate & Finance - International Counsel in Latin America (Florida-Based)," Chambers Latin America Awards, 2017
  • Member, American Bar Association
    • Steering Committee, Aerospace & Defense Industries Committee, Section of International Law and Practice (2014-2015)


  • J.D., Northwestern Pritzker School of Law, 2008
    • Senior Editor, Northwestern Journal of International Law and Business
  • B.A., cum laude, Yale University, 2003
  • District of Columbia
  • Illinois
  • French, Conversational
  • Spanish, Conversational