John D. Day (from Kinmundy, Illinois, born 1947) is an electrical engineer, an Internet pioneer, and a historian. He has been involved in the development of the communication protocols of Internet and its predecessor ARPANET since the 1970s, and he was also active in the design of the OSI reference model. He has contributed in the research and development of network management systems, distributed databases, supercomputing, and operating systems.
Day is the author of the 2008 book Patterns in Network Architecture: A Return to Fundamentals, which gave rise to Network IPC, later referred to as the Recursive InterNetwork Architecture (RINA), and the RFC documents RFC 520, RFC 728, RFC 731, and RFC 732. He has also published articles on the history of cartography, on topics such as Matteo Ricci's 16th–17th century maps.
- Day, John D. (2008). Patterns in network architecture : a return to fundamentals. Library of Congress Catalog Record. ISBN 9780132252423. Retrieved 2010-01-23.
- Johnson, Johna Till (Mar 16, 2008). "Remember the Internet's past, or risk repeating it". IT World Canada. Archived from the original on 27 September 2011.
- Crowcroft, Jon (2008). "Book review: Patterns in Network Architecture" (PDF). The Internet Protocol Journal. 11 (1): 37–38.
- "John Day, ECE Adjunct Professor, Department Spotlight Seminar". Boston University, Department of Electrical & Computer Engineering. 2008. Retrieved 2010-01-23.
- "Authors: John Day". InformIT. Pearson Education. Retrieved 2010-01-23.
- "John Day curriculum vitae". A History of Computer Communications. Archived from the original on 8 October 2018. Retrieved August 8, 2013.
- Day, John D.; Zimmermann, Hubert (1983). "The OSI reference model". Proceedings of the IEEE. 71 (12): 1334–1340. doi:10.1109/proc.1983.12775. S2CID 30875675.
- "Part-Time Faculty". Boston University Metropolitan College, Department of Computer Science. Retrieved 2010-01-23.
- Day, John (2007). Patterns in Network Architecture: A Return to Fundamentals. Prentice Hall. ISBN 978-0-13-225242-3.
- Day, John D. (1995). "The search for the origins of the Chinese manuscript of Matteo Ricci's maps". Imago Mundi. 47: 94–117. doi:10.1080/03085699508592815. JSTOR 1151306.
- John Day Papers (CBI 165), Charles Babbage Institute, University of Minnesota.
- Oral history interview with John Day, Charles Babbage Institute, University of Minnesota. Describes his computer science education at the University of Illinois at Urbana-Champaign, including vignettes of student life in the late 1960s and early 1970s and campus protests over work on the ILLIAC IV computer. A second portion of the interview gives highlights of his work on network standards-setting, including Open Systems Interconnection (OSI) model and American National Standards Institute (ANSI).