Robert Kraut is Herbert A. Simon Professor of Human-Computer Interaction at Carnegie Mellon University. He received his PhD in social psychology from Yale University in 1973 and has previously taught at the University of Pennsylvania and Cornell University. He was a research scientist at AT&T Bell Laboratories and Bell Communications Research for 12 years. Dr. Kraut has broad interests in the design and social impact of computing and conducts research on everyday use of the Internet, technology and conversation, collaboration in small work groups, and computing in organizations. His most recent work examines factors influencing the success of online communities and ways to apply psychology theory to their design. More information is available at http://www.cs.cmu.edu/~kraut.