John McCarthy
John McCarthy at a conference in 2006
Born	(1927-09-04)September 4, 1927 Boston, Massachusetts, U.S.
Died	October 24, 2011(2011-10-24) (aged 84) Stanford, California, U.S.
Residence	United States
Nationality	American
Fields	Computer Technology
Institutions	Stanford University; Massachusetts Institute of Technology; Dartmouth College; Princeton University
Alma mater	Princeton University; California Institute of Technology
Doctoral advisor	Solomon Lefschetz
Doctoral students	Ruzena Bajcsy Randall Davis Cordell Green Ramanathan V. Guha Barbara Liskov Robert Moore Francis Morris Raj Reddy Donald Kaplan Eyal Amir Aarati Parmar Martino
Known for	Artificial intelligence; Lisp; Circumscription; Situation calculus
Notable awards	Turing Award (1971) Kyoto Prize (1988) National Medal of Science (1990) Benjamin Franklin Medal (2003)

John McCarthy (September 4, 1927 – October 24, 2011)^{[1][2][3][4][5][6]} was an American computer scientist and cognitive scientist. He invented the term "artificial intelligence" (AI), developed the Lisp programming language family, significantly influenced the design of the ALGOL programming language, popularized timesharing, and was very influential in the early development of AI.

McCarthy received many accolades and honors, including the Turing Award for his contributions to the topic of AI, the United States National Medal of Science, and the Kyoto Prize.

  Personal life and education

John McCarthy was born in Boston, Massachusetts on September 4, 1927 to an Irish immigrant father and a Lithuanian Jewish immigrant mother,^[7] John Patrick and Ida Glatt McCarthy. The family was obliged to relocate frequently during the Great Depression, until McCarthy's father found work as an organizer for the Amalgamated Clothing Workers in Los Angeles, California.

McCarthy was exceptionally intelligent, and graduated from Belmont High School two years early.^[8] He showed an early aptitude for mathematics; during his teens he taught himself college mathematics by studying the textbooks used at the nearby California Institute of Technology (Caltech). As a result, when McCarthy was accepted into Caltech during 1944, he was able to skip the first two years of mathematics.^[9]

McCarthy was reportedly expelled from Caltech for failure to attend physical education courses^{[citation needed]}; he then served in the US Army and was readmitted, receiving a B.S. in Mathematics during 1948. It was at Caltech that he attended a lecture by John Von Neumann that inspired his future endeavors. McCarthy initially continued his studies at Caltech. He received a Ph.D. in Mathematics from Princeton University during 1951 as a student of Solomon Lefschetz.

McCarthy was married three times. His second wife was Vera Watson, a programmer and mountaineer who died during 1978 attempting to scale Annapurna I. He later married Carolyn Talcott, a computer scientist at Stanford and later SRI International.^[10][11]

  Career in computer science

After short-term appointments at Princeton, Stanford University, Dartmouth, and MIT, he became a full professor at Stanford during 1962, where he remained until his retirement at the end of 2000. By the end of his early days at MIT he was already affectionately referred to as "Uncle John" by his students.^[12]

McCarthy championed mathematical logic for artificial intelligence. During 1956, he organized the first international conference to emphasize artificial intelligence. One of the attendees was Marvin Minsky, who became, later, one of the main AI theorists, and joined McCarthy at MIT during 1959.^[8] During the autumn of 1956, McCarthy won an MIT research fellowship. He served on the committee that designed ALGOL, which became a very influential programming language by introducing many new constructs now in common use. During 1958, he proposed the advice taker, which inspired later work on question-answering and logic programming. Around 1959, he invented so-called "garbage collection" methods to solve problems in Lisp.^[13][14] Based on the lambda calculus, Lisp soon became the programming language of choice for AI applications after its publication during 1960.^[15] He helped to motivate the creation of Project MAC at MIT, but left MIT for Stanford University during 1962, where he helped establish the Stanford AI Laboratory, for many years a friendly rival to Project MAC.

During 1961, he was the first to suggest publicly (in a speech given to celebrate MIT's centennial) that computer time-sharing technology might result in a future in which computing power and even specific applications could be sold through the utility business model (like water or electricity). This idea of a computer or information utility was very popular during the late 1960s, but faded by the mid-1990s. However, since 2000, the idea has resurfaced in new forms (see application service provider, grid computing, and cloud computing).

During 1966, McCarthy and his team at Stanford wrote a computer program used to play a series of chess games with counterparts in the Soviet Union; McCarthy's team lost two games and drew two games, see Kotok-McCarthy.

From 1978 to 1986, McCarthy developed the circumscription method of non-monotonic reasoning.

McCarthy is also credited with developing an early form of time-sharing. His colleague Lester Earnest told the Los Angeles Times: "The Internet would not have happened nearly as soon as it did except for the fact that John initiated the development of time-sharing systems. We keep inventing new names for time-sharing. It came to be called servers.… Now we call it cloud computing. That is still just time-sharing. John started it."^[8]

During 1982 he seems to have originated the idea of the "space fountain", a type of tower extending into space and kept vertical by the outward force of a stream of pellets propelled from Earth along a sort of conveyor belt which returns the pellets to Earth (payloads would ride the conveyor belt upward).^[16]

McCarthy often commented on world affairs on the Usenet forums. Some of his ideas can be found in his sustainability Web page,^[17] which is "aimed at showing that human material progress is desirable and sustainable". McCarthy was a serious book reader, an optimist, and a staunch supporter of free speech. His best Usenet interaction is visible in rec.arts.books archives. And John actively attended SF Bay Area dinners in Palo Alto of r.a.b. readers called rab-fests. John went on to defend free speech criticism involving European ethnic jokes at Stanford.

McCarthy saw the importance of mathematics and mathematics education which included a license plate guard on his BMW car noting: those who don't speak math are doomed to speak nonsense (paraphrased). He advised 30 PhD graduates ^[18].

His 2001 short story "The Robot and the Baby"^[19] farcically explored the question of whether robots should have (or simulate having) emotions, and anticipated aspects of Internet culture and social networking that became more prominent during the ensuing decade.^[20]

  Awards and honors

• Turing Award from the Association for Computing Machinery (1971).
• Kyoto Prize (1988).
• National Medal of Science (USA) in Mathematical, Statistical, and Computational Sciences (1990)^[21].
• Inducted as a Fellow of the Computer History Museum (1999)
• Benjamin Franklin Medal in Computer and Cognitive Science from the Franklin Institute (2003).
• Inducted into IEEE Intelligent Systems' AI's Hall of Fame (2011), for the "significant contributions to the field of AI and intelligent systems".^[22][23]

  Major publications

• McCarthy, J. 1959. Programs with Common Sense. In Proceedings of the Teddington Conference on the Mechanization of Thought Processes, 756-91. London: Her Majesty's Stationery Office.
• McCarthy, J. 1960. Recursive functions of symbolic expressions and their computation by machine. Communications of the ACM 3(4):184-195.
• McCarthy, J. 1963a A basis for a mathematical theory of computation. In Computer Programming and formal systems. North-Holland.
• McCarthy, J. 1963b. Situations, actions, and causal laws. Technical report, Stanford University.
• McCarthy, J., and Hayes, P. J. 1969. Some philosophical problems from the standpoint of artificial intelligence. In Meltzer, B., and Michie, D., eds., Machine Intelligence 4. Edinburgh: Edinburgh University Press. 463-502.
• McCarthy, J. 1977. Epistemological problems of artificial intelligence. In IJCAI, 1038-1044.
• McCarthy, J. 1980. Circumscription: A form of non-monotonic reasoning. Artificial Intelligence 13(1-2):23-79.
• McCarthy, J. 1986. Applications of circumscription to common sense reasoning. Artificial Intelligence 28(1):89-116.
• McCarthy, J. 1990. Generality in artificial intelligence. In Lifschitz, V., ed., Formalizing Common Sense. Ablex. 226-236.
• McCarthy, J. 1993. Notes on formalizing context. In IJCAI, 555-562.
• McCarthy, J., and Buvac, S. 1997. Formalizing context: Expanded notes. In Aliseda, A.; van Glabbeek, R.; and Westerstahl, D., eds., Computing Natural Language. Stanford University. Also available as Stanford Technical Note STAN-CS-TN-94-13.
• McCarthy, J. 1998. Elaboration tolerance. In Working Papers of the Fourth International Symposium on Logical formalizations of Commonsense Reasoning, Commonsense-1998.
• Costello, T., and McCarthy, J. 1999. Useful counterfactuals. Electronic Transactions on Artificial Intelligence 3(A):51-76
• McCarthy, J. 2002. Actions and other events in situation calculus. In Fensel, D.; Giunchiglia, F.; McGuinness, D.; and Williams, M., eds., Proceedings of KR-2002, 615-628.

  See also

	Computer science portal
	Biography portal

• Cornucopian
• Frame problem
• Kotok-McCarthy
• McCarthy 91 function
• McCarthy formalism

  References

  Further reading

• Philip J. Hilts, Scientific Temperaments: Three Lives in Contemporary Science, Simon and Schuster, 1982. Lengthy profiles of John McCarthy, physicist Robert R. Wilson and geneticist Mark Ptashne.
• Pamela McCorduck, Machines Who Think: a personal inquiry into the history and prospects of artificial intelligence, 1979, second edition 2004.
• Pamela Weintraub, ed., The Omni Interviews, New York: Ticknor and Fields, 1984. Collected interviews originally published in Omni magazine; contains an interview with McCarthy.

  External links

Wikimedia Commons has media related to: John McCarthy (computer scientist)

Wikiquote has a collection of quotations related to: John McCarthy

• McCarthy's Stanford home page.
• List of publications from the DBLP Bibliography Server.
• John McCarthy at the Mathematics Genealogy Project
• John McCarthy at the AI Genealogy Project.
• Celebration of John McCarthy's Accomplishments at Stanford University.
• Interview with Guy Steele conducted at OOPSLA 2008; Set of interviews:
• Oral history interview with John McCarthy at Charles Babbage Institute, University of Minnesota, Minneapolis. McCarthy discusses his role in the development of time-sharing at the Massachusetts Institute of Technology. He also describes his work in artificial intelligence (AI) funded by the Advanced Research Projects Agency, including logic-based AI (Lisp) and robotics.
• Oral history interview with Marvin Minsky at Charles Babbage Institute, University of Minnesota, Minneapolis. Minsky describes artificial intelligence (AI) research at the Massachusetts Institute of Technology (MIT), including the work of John McCarthy.
• Oral history interview with Jack B. Dennis at Charles Babbage Institute, University of Minnesota, Minneapolis. Dennis discusses the work of John McCarthy on time-sharing, and the influence of DARPA's Information Processing Techniques Office on the development of time-sharing.
• Oral history interview with Fernando J. Corbató at Charles Babbage Institute, University of Minnesota, Minneapolis. Corbató discusses computer science research, especially time-sharing, at the Massachusetts Institute of Technology (MIT), including John McCarthy and research on time-sharing.
• John McCarthy (computer scientist) at Find a Grave