Richard D. Greenblatt is a programmer.

Along with Bill Gosper, he may be considered to have founded the hacker community, and holds pride of place in the Lisp community. R. William Gosper, Jr. ... Hacker is a term used to describe different types of computer experts. ... Lisp is a functional programming language family with a long history. ...

Affiliated with the MIT AI Lab during his prime, he is known as the "hacker of hackers" or "hackers hacker". ...

He wrote the MacHack, in response to the claim by AI sceptic Hubert Dreyfus that computers would not be able to play chess. Dreyfus was beaten by the program, and this marked the beginning of computer chess. MacHack ist a chess program written in the 1960s by MIT student Richard Greenblatt. ... Hubert Dreyfus, Ph. ... The idea of creating a chess-playing machine dates back to the eighteenth century. ...

He also wrote, with Tom Knight and Stewart Nelson, the Incompatible Timesharing System, a highly influential timesharing operating system for the PDP-6 and PDP-10 used at MIT. Tom Knight is the station manager of the University of Surreys Student Radio Station, GU2 Radio. ... ITS, the Incompatible Timesharing System, was an early, revolutionary, and influential MIT time-sharing operating system; it was developed principally by the Artificial Intelligence Laboratory at MIT, with some help from Project MAC. ITS development was initiated in the late 1960s by those (notably the majority of the AI Lab... Alternate uses: see Timesharing Time-sharing is an approach to interactive computing in which a single computer is used to provide apparently simultaneous interactive general-purpose computing to multiple users by sharing processor time. ... The PDP-6 (Programmed Data Processor-6) was a computer model developed by Digital Equipment Corporation (DEC) in 1963. ... The PDP-10 was a computer manufactured by Digital Equipment Corporation (DEC) from the late 1960s on; the name stands for Programmed Data Processor model 10. It was the machine that made time-sharing common; it looms large in hacker folklore because of its adoption in the 1970s by many... The Massachusetts Institute of Technology, or MIT, is a research institution and university located in the city of Cambridge, Massachusetts along the Charles River and across from Bostons Back Bay district. ...

Later, he was the main designer of the MIT Lisp machine. He founded the Lisp Machines, Inc., according to his vision of an ideal hacker-friendly computer company. Lisp machines were general purpose computers designed (often with hardware support) to efficiently run Lisp as their main language. ... This article needs cleanup. ...