Introduction

DAVID D. CLARK, a Fellow of the American Academy since 2002, is a Senior Research Scientist at the MIT Computer Science and Artificial Intelligence Laboratory. He served as Chief Protocol Architect in the development of the Internet. His current research looks at redefining the architectural underpinnings of the Internet and the relation of technology and architecture to economic, societal, and policy considerations. He is helping the U.S. National Science Foundation organize its Future Internet Design program.