Tatiana Sullivan has extensive experience on a range of national security law matters, including those involving Foreign Ownership, Control, or Influence; Committee on Foreign Investment in the United States (CFIUS); International Traffic in Arms Regulations; and Export Administration Regulations. Her clients have included companies in the aerospace, communications, defense, manufacturing, real estate, and technology industries.

Ms. Sullivan spent several years working at the U.S. Department of Defense, serving as associate director of CFIUS Operations & Regulatory Affairs and as lead export control analyst. In these roles, she led the department’s Foreign Investment Risk Review Modernization Act negotiations and regulatory implementation, served as the lead negotiator for several high profile mitigation agreements, represented the department on the Operating Committee and provided direct support to senior officials on the Advisory Committee on Export Policy.

Prior to her time at the DOD, Ms. Sullivan worked as a trade policy associate for the U.S. Senate Committee on Finance and as an intern for the World Trade Organization.



  • J.D., Washington College of Law, American University, 2010 (Executive Editor, American University Business Law Review)
  • B.A., College of the Holy Cross, 2007 (cum laude)


  • New York

Tatiana O. Sullivan

Associate, National Security; CFIUS and Foreign Investment Reviews