called Sense 21, which was the basis of his project to understand innovation as a skill. He created a course on Core of Information, Technology the basis his Great Principles of Computing project. At Naval Postgraduate School since 2002 he heads the Computer Science Department, directs the Cebrowski Institute for Innovation and Information Superiority. He chaired the faculty council. Denning served continuously as a volunteer in Association for Computing Machinery (ACM) since 1967. In that time he served as president, vice president, three board chairs, Member-at-Large, Editor of ACM Computing Surveys, and Editor of the monthly ACM Communications. He received seven ACM awards for service, technical contribution, and education. ACM presented him with a special award in June 2007 recognizing 40 years of continuous service. Denning has received 26 awards for service and technical contributions. These include one quality customer service award, three professional society fellowships, three honorary degrees, six awards for technical contribution, six for distinguished service, and seven for education. Denning's career has been a search for fundamental principles in subfields of computing. He writes prolifically. From 1980 to 1982 he wrote 24 columns as ACM President, focusing on technical and political issues of the field. From 1985 to 1993 he wrote 47 columns on "The Science of Computing" for American Scientist magazine, focusing on scientific principles from across the field. Beginning in 2001 he has written quarterly "IT Profession" columns for Communications of the ACM, focusing on principles of value to practicing professionals. Virtual memory In 1970 he published a classic paper that displayed a scientific framework for virtual memory and the validating scientific evidence, putting to rest a controversy over virtual memory stability and performance. In 1966 he proposed the working set as a dynamic measure of memory demand and explained why it worked using the locality idea introduced by Les Belady of IBM. His working set paper became a classic. It received an ACM Best paper award in 1968 and a SIGOPS Hall of Fame Award in 2005. Operating system principles In the early 1970s he collaborated with Ed Coffman Jr., on Operating Systems Theory, which became a classic textbook used in graduate courses and stayed in print until 1995. That book helped to erase doubts that the OS field could be approached as a science. In the middle 1970s he collaborated with Jeffrey Buzen on operational analysis, extending Buzen's basic operational laws to deal