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David Clark is a Senior Research Scientist at the MIT Computer Science and Artificial Intelligence Laboratory. He is co-director of the MIT Communications Futures Program, a project for industry collaboration and coordination along the communications value chain. 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 is helping the U.S. National Science foundation organize their Future Internet Design 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 was elected to the American Çï¿ûÊÓƵ of Arts and Sciences in 2002 and serves as a member of its Council.