Charles Hansen received the BS degree in computer science from Memphis State University in 1981 and the PhD degree in computer science from the University of Utah in 1987. He is an associate professor of computer science at the University of Utah. From 1997 to 1999, he was a research associate professor in computer science at Utah. From 1989 to 1997, he was a technical staff member in the Advanced Computing Laboratory (ACL) located at Los Alamos National Laboratory, where he formed and directed the visualization efforts in the ACL. He was a Bourse de Chateaubriand PostDoc Fellow at INRIA, Rocquencourt, France, in 1987 and 1988. His research interests include large-scale scientific visualization and computer graphics.