The editors wish to thank the many research team members who gave of their time freely to thiscollaborative research project. Members of the Blomberg, Gordon, and Rose research teams werefunded by the Center for Risk and Economic Analysis of Terrorism Events (CREATE) throughthe U.S. Department of Homeland Security. We wish to thank Dr. Matt Clark, Director of DHSUniversity Programs for conceiving of the Economic Impact Modeling Forum (EIMF) and BryanRoberts for suggesting that its first application be to the September 11 Attacks. We also thankmembers of the EIMF Advisory Board, Michael Kline, Hill Huntington, and Mike Lahr, for theirguidanceduringthecourseoftheprocessandforreviewingdrafts. Inadditionweacknowledgethehelpful suggestions of Marilyn Morgan of DHS. We also wish to thank participants at a workshopheld at the Homeland Security Institute July 28 for helpful feedback, as well as participants in twosessions devoted to this topic at the 2008 North American Regional Science Council Meetings.We single out Ron Horst among research team members for helping to verify and reconcile thesummary table appearing in this Editor’s Introduction. Thanks are also extended to Sasha Marcusand Ruby Borders for assisting in reformatting the papers.