0.4 About the Authors

Clayton Lewis is Professor of Computer Science and a member of the Institute of Cognitive Science at the University of Colorado. Before coming to Colorado he worked as a programmer, researcher, and manager of user interface development in corporate settings in the United States and England. He has continued to maintain close contacts with industry. Clayton holds a Ph.D. in psychology from the University of Michigan. His current research involves theoretical analysis of learning processes, assessment and design of programming languages, and development of prototyping tools.

John Rieman is finishing a Ph.D. in computer science at the University of Colorado, where he is investigating users' techniques for learning new interfaces in the absence of formal training, His interest in user interfaces developed during 10 years "in the trenches" as a user and manager of computerized editorial and typesetting systems. John's varied background also includes studies in art, mathematics, and law, as well as work experience as an auto mechanic and truck driver.

Both authors have taught courses in user interface design using draft versions of portions of this book.