· Global Co-Managing Partner and Chief Strategy Officer, K2 Integrity2020–
· Deputy Assistant to the President and Deputy National Security Advisor for Combating Terrorism, The White House2005–2009
· Assistant Secretary of the Treasury for Terrorist Financing and Financial Crimes, Department of the Treasury2004–2005
· Prosecutor, Terrorism and Violent Crime Section, Department of Justice1997–
· Senior Adviser (Non-resident), Center for Strategic and International Studies (CSIS)
· Senior Fellow, Combating Terrorism Center at West Point
· Chair and Co-founder, Consilient
· Chairman and Senior Counselor, Center on Economic and Financial Power (CEFP), Foundation for Defense of Democracies
· Visiting Lecturer in Law, Harvard Law School
· Senior National Security Analyst, NBC News and MSNBC