Susan Ginsburg, an attorney, is Principal at U.S. Civil Security, LLC and former head of MPI's Mobility and Security Program. She is a member of the Department of Homeland Security's Quadrennial Review Advisory Committee and served on the Secure Borders and Open Doors Advisory Committee. Prior to joining MPI, she served as Senior Counsel and Team Leader on the staff of the National Commission on Terrorist Attacks Upon the United States (9/11 Commission), where she was responsible for research and policy recommendations concerning the entry of the 9/11 hijackers, terrorist travel, and border controls. She followed her work on the 9/11 Commission with consulting and policy writing focused on terrorist mobility.