The Fourth IEEE Conference on Open Architectures and Network Programming Conference Committee Organizing Committee General Chair: Raj Yavatkar, Intel Corp. Program Co-Chair: Andrew Campbell, Columbia University Program Co-Chair: David Wetherall, University of Washington Publications Chair: John Vicente, Intel Corp. Publicity Chair: Samrat Bhattacharjee, University of Maryland IEEE ComSoc Coordinator: Steve Weinstein, NEC USA Webmaster: Michael Kounavis, Columbia University Program Committee (members of the OC are also members of the PC): Vaduvur Bharghavan, UIUC Ken Calvert, University of Kentucky Jon Crowcroft, UCL, UK Gisli Hjalmtysson, AT&T Research Alden Jackson, BBN Technologies Aurel Lazar, Xbind Inc. Ian Marshall, BT Labs Gary Minden, University of Kansas Craig Partridge, BBN Technologies Dan Raz, Lucent Bell Labs Rolf Stadler, Columbia University Franco Travostino, Nortel Networks Christian Tschudin, Uppsala University Ian Wakeman, University of Sussex Yechiam Yemini, Columbia University Bob Braden, USC ISI Roy Campbell, UIUC Bruce Davie, Cisco David Hutchison, Lancaster University Kalai Kalaichelvan, Nortel Networks Ian Leslie, Cambridge University Nick Maxemchuk, AT&T Research Labs Giovanni Pacifici, IBM Larry Peterson, Princeton University Jonathan Smith, University Penn. Peter Steenkiste, CMU James Sterbenz, BBN Technologies David Tennenhouse, Intel Corp. Harrick Vin, UT Austin Ellen Zegura, Georgia Tech.