Geoffrey C. Bowker is Director, Center for Science, Technology, and Society, Santa Clara University. He studies political, organizational, and social factors in the design of scientific cyber-infrastructure, most notably in the domains of biodiversity science and the geosciences. He is author with Leigh Star of Sorting Things Out: Classification and Practice and has just completed a manuscript entitled Memory Practices in the Sciences.

Teresa Caldeira is Associate Professor of Anthropology at the University of California, Irvine. Her research has focused on the interconnections among urban violence, spatial segregation, and democratization. Currently, she is investigating the recreation of gender and generational roles among Sao Paulo youth in the context of increasing urban violence and of unprecedented access to information and to new technologies. Her book City of Walls: Crime, Segregation, and Citizenship in Sao Paulo won the 2001 Senior Book Award of the American Ethnological Society.