with all queueing networks. The operational framework explained why computer performance models work so well, even though violating the traditional stochastic Markovian assumptions. It has become the preferred method for teaching performance prediction in computing courses. In the early 1980s, he was one of the four founding Principal investigators of Computer Science Network, sponsored by the National Science Foundation The other three were Dave Farber, Larry Landweber, and Tony Hearn. They led the development of a fully self-supporting CS community network that by 1986 included 165 sites and 50,000 users. CSNET was the key transitional stepping stone from the original ARPANET to the NSFNET and then the Internet. In 2009, the Internet Society awarded CSNET its prestigious Jon Postel award, recognizing its key role in bridging from the ARPANET to NSFNET. He led the ACM Digital Library project 1992-97, which went live in 1997. The Association for Computing Machinery became the first professional society to offer a fully searchable library of everything it ever published. Great Principles of Computing In 1999, he expanded the search for fundamental principles to cover all of computing. The discovery of natural information processes in biology, physics, economics, materials, and other fields convinced him that the basic definitions of computation had to be modified to encompass natural information processes as well as artificial. He and his team have produced a draft framework. The Great Principles framework revealed that "innovating" is a core practice of computing. Unable to find anyone who understood how to teach the skill of innovating, he joined with Bob Dunham and identified eight foundational practices of innovation. They published The Innovator's Way, a book laying the eight essential practices of successful innovation. Computing education Denning has been a major influence in computing education. In the early 1970s he led a task force that designed the first core course on operating systems (OS) principles. OS became the first non-math CS core course. In the mid 1980s he led a joint ACM/IEEE committee that described computing as a discipline with nine functional areas and three cognitive processes, the basis of ACM Curriculum 1991. In the 1990s he set out on a quest to codify the great principles of computing. He maintains that computing is a science both of natural and artificial information processes. NSF designated him a Distinguished Education Fellow in 2007 to launch a movement to use the Great Principles framework for innovations