Graduate, Brandeis University. Graduate, Johns Hopkins School International Affairs.
With Ernst & Young, London. Director international operations RGTI Systems, 1992—1994. Senior policy analyst national security & international affairs Office Science & Technology Policy, Executive Office of the President, Washington, 1995—1998.
Senior adviser to secretary United States Department Energy, 1998—2001. Senior fellow, founder & director Homeland Security Program Center for Strategic and International Studies, 2001—2009. Assistant secretary for policy United States Department Homeland Security, since 2009.
Adjunct professor security studies Georgetown University School Foreign Policy. Lecturer in field.