John D. Day (from Kinmundy, Illinois, born 1947)[1] is an electrical engineer, an Internet pioneer,[2] and a historian.
[2][3][4] He has been involved in the development of the communication protocols of Internet and its predecessor ARPANET since the 1970s,[4][5] and he was also active in the design of the OSI reference model.
[6] From 1969 through 1978 he worked on the Illiac IV supercomputer project.
Day was adjunct professor at Worcester Polytechnic Institute in 2006 and is currently a lecturer in Computer Science at Boston University Metropolitan College.
He has also published articles on the history of cartography,[6][8] on topics such as Matteo Ricci's 16th–17th century maps.