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an American mathematician, computer scientist, and pioneer in [https://en.wikipedia.org/wiki/Communications_protocol network protocols] and [https://en.wikipedia.org/wiki/Network_security security]. As undergraduate at [[Massachusetts Institute of Technology]] and fellow of [[Richard Greenblatt]], Eastlake was co-developer of [[ITS]] (Incompatible Timesharing System), the [[PDP-6]] operating system on which [[MacLisp]] was developed <ref>[http://www.softwarepreservation.org/projects/LISP/ History of LISP] from [http://www.softwarepreservation.org/ The Software Preservation Group] of [http://www.computerhistory.org/ The Computer History Museum]</ref>, and [[Mac Hack|The Greenblatt Chess Program]] or ''Mac Hack VI'' in 1966 <ref>[[Richard Greenblatt]], [[Donald Eastlake]], [[Stephen D. Crocker]] ('''1967'''). ''The Greenblatt Chess Program''. Proceedings of the AfiPs Fall Joint Computer Conference, Vol. 31, pp. 801-810. Reprinted reprinted ('''1988''') in [[Computer Chess Compendium]]</ref>.