Sherry Turkle is Abby Rockefeller Mauze Professor of the Social Studies of Science and Technology at MIT and Founder and Director of the MIT Initiative on Technology and Self. A psychoanalytically trained sociologist and psychologist, she is the author of The Second Self- Computers and the Human Spirit (Twentieth Anniversary Edition, MIT Press), Life on the Screen- Identity in the Age of the Internet, and Psychoanalytic Politics- Jacques Lacan and Freud's French Revolution. She is the editor of Evocative Objects- Things We Think With, Falling for Science- Objects in Mind, and The Inner History of Devices, all three published by the MIT Press. William J. Clancey is Chief Scientist of Human-Centered Computing in the Intelligent Systems Division at NASA Ames Research Center, and Senior Research Scientist at the Florida Institute for Human and Machine Cognition. Stefan Helmreich is Elting E. Morison Professor of Anthropology at MIT. He is the author of Alien Ocean, Sounding the Limits of Life, and Silicon Second Nature. Yanni Alexander Loukissas is Assistant Professor of Digital Media in the School of Literature, Media, and Communication at Georgia Institute of Technology. He is the author of Co-Designers- Cultures of Computer Simulation in Architecture.