David Clark is a Senior Research Scientist at the MIT Computer Science and Artificial Intelligence Laboratory. Since the mid-70s, Clark has been leading the development of the Internet; from 1981-1989 he acted as Chief Protocol Architect in this development, and chaired the Internet Activities Board. His current research looks at re-definition of the architectural underpinnings of the Internet, and the relation of technology and architecture to economic, societal and policy considerations. He helped the U.S. National Science Foundation organize their Future Internet Architecture program. He is past chairman of the Computer Science and Telecommunications Board of the National Academies, and has contributed to a number of studies on the societal and policy impact of computer communications. He is a member of the National Academy of Engineering and the American Academy of Arts and Sciences and serves as a member of the AAAS Council.