Dr. Walter Savitch is Professor Emeritus of Computer Science at the University of California-San Diego. He received his Ph.D. in mathematics from the University of California-Berkeley (USA) in 1969. Since that time Dr. Savitch has been on the faculty of the University of California-San Diego. He served as director of the university’s Interdisciplinary Ph.D. program in cognitive science for over 10 years. He has also served as a visiting researcher at the computer science departments of the University of Colorado in Boulder, and the University of Washington in Seattle, and has been a visiting scholar at the Centrum voor Wiskunde en Informatica in Amsterdam (Netherlands).