Claude Elwood Shannon (April 30, 1916 – February 24, 2001) was an American mathematician, electrical engineer, computer scientist and cryptographer known as the "father of information theory".^{[1]}^{[2]}
As a 21yearold master's degree student at the Massachusetts Institute of Technology (MIT), he wrote his thesis demonstrating that electrical applications of Boolean algebra could construct any logical numerical relationship.^{[3]} Shannon contributed to the field of cryptanalysis for national defense of the United States during World War II, including his fundamental work on codebreaking and secure telecommunications. His mathematical theory of information became very well cited and laid the foundation for the field of information theory.
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Biography
Childhood
The Shannon family lived in Gaylord, Michigan, and Claude was born in a hospital in nearby Petoskey.^{[1]} His father, Claude Sr. (1862–1934), was a businessman and for a while, a judge of probate in Gaylord. His mother, Mabel Wolf Shannon (1890–1945), was a language teacher, who also served as the principal of Gaylord High School.^{[4]} Claude Sr. was a descendant of New Jersey settlers, while Mabel was a child of German immigrants.^{[1]} Shannon's family was active in their Methodist Church during his youth.^{[5]}
Most of the first 16 years of Shannon's life were spent in Gaylord, where he attended public school, graduating from Gaylord High School in 1932. Shannon showed an inclination towards mechanical and electrical things. His best subjects were science and mathematics. At home, he constructed such devices as models of planes, a radiocontrolled model boat and a barbedwire telegraph system to a friend's house a halfmile away.^{[6]} While growing up, he also worked as a messenger for the Western Union company.
Shannon's childhood hero was Thomas Edison, who he later learned was a distant cousin. Both Shannon and Edison were descendants of John Ogden (1609–1682), a colonial leader and an ancestor of many distinguished people.^{[7]}^{[8]}
Logic circuits
In 1932, Shannon entered the University of Michigan, where he was introduced to the work of George Boole. He graduated in 1936 with two bachelor's degrees: one in electrical engineering and the other in mathematics.
In 1936, Shannon began his graduate studies in electrical engineering at MIT, where he worked on Vannevar Bush's differential analyzer, an early analog computer.^{[9]} While studying the complicated ad hoc circuits of this analyzer, Shannon designed switching circuits based on Boole's concepts. In 1937, he wrote his master's degree thesis, A Symbolic Analysis of Relay and Switching Circuits.^{[10]} A paper from this thesis was published in 1938.^{[11]} In this work, Shannon proved that his switching circuits could be used to simplify the arrangement of the electromechanical relays that were used during that time in telephone call routing switches. Next, he expanded this concept, proving that these circuits could solve all problems that Boolean algebra could solve. In the last chapter, he presented diagrams of several circuits, including a 4bit full adder.^{[10]}
Using this property of electrical switches to implement logic is the fundamental concept that underlies all electronic digital computers. Shannon's work became the foundation of digital circuit design, as it became widely known in the electrical engineering community during and after World War II. The theoretical rigor of Shannon's work superseded the ad hoc methods that had prevailed previously. Howard Gardner called Shannon's thesis "possibly the most important, and also the most noted, master's thesis of the century."^{[12]}
Shannon received his PhD in mathematics from MIT in 1940.^{[7]} Vannevar Bush had suggested that Shannon should work on his dissertation at the Cold Spring Harbor Laboratory, in order to develop a mathematical formulation for Mendelian genetics. This research resulted in Shannon's PhD thesis, called An Algebra for Theoretical Genetics.^{[13]}
In 1940, Shannon became a National Research Fellow at the Institute for Advanced Study in Princeton, New Jersey. In Princeton, Shannon had the opportunity to discuss his ideas with influential scientists and mathematicians such as Hermann Weyl and John von Neumann, and he also had occasional encounters with Albert Einstein and Kurt Gödel. Shannon worked freely across disciplines, and this ability may have contributed to his later development of mathematical information theory.^{[14]}
Wartime research
Shannon then joined Bell Labs to work on firecontrol systems and cryptography during World War II, under a contract with section D2 (Control Systems section) of the National Defense Research Committee (NDRC).
Shannon is credited with the invention of signalflow graphs, in 1942. He discovered the topological gain formula while investigating the functional operation of an analog computer.^{[15]}
For two months early in 1943, Shannon came into contact with the leading British mathematician Alan Turing. Turing had been posted to Washington to share with the U.S. Navy's cryptanalytic service the methods used by the British Government Code and Cypher School at Bletchley Park to break the ciphers used by the Kriegsmarine Uboats in the north Atlantic Ocean.^{[16]} He was also interested in the encipherment of speech and to this end spent time at Bell Labs. Shannon and Turing met at teatime in the cafeteria.^{[16]} Turing showed Shannon his 1936 paper that defined what is now known as the "universal Turing machine".^{[17]}^{[18]} This impressed Shannon, as many of its ideas complemented his own.
In 1945, as the war was coming to an end, the NDRC was issuing a summary of technical reports as a last step prior to its eventual closing down. Inside the volume on fire control, a special essay titled Data Smoothing and Prediction in FireControl Systems, coauthored by Shannon, Ralph Beebe Blackman, and Hendrik Wade Bode, formally treated the problem of smoothing the data in firecontrol by analogy with "the problem of separating a signal from interfering noise in communications systems."^{[19]} In other words, it modeled the problem in terms of data and signal processing and thus heralded the coming of the Information Age.
Shannon's work on cryptography was even more closely related to his later publications on communication theory.^{[20]} At the close of the war, he prepared a classified memorandum for Bell Telephone Labs entitled "A Mathematical Theory of Cryptography", dated September 1945. A declassified version of this paper was published in 1949 as "Communication Theory of Secrecy Systems" in the Bell System Technical Journal. This paper incorporated many of the concepts and mathematical formulations that also appeared in his A Mathematical Theory of Communication. Shannon said that his wartime insights into communication theory and cryptography developed simultaneously and that "they were so close together you couldn't separate them".^{[21]} In a footnote near the beginning of the classified report, Shannon announced his intention to "develop these results … in a forthcoming memorandum on the transmission of information."^{[22]}
While he was at Bell Labs, Shannon proved that the cryptographic onetime pad is unbreakable in his classified research that was later published 1949. The same article also proved that any unbreakable system must have essentially the same characteristics as the onetime pad: the key must be truly random, as large as the plaintext, never reused in whole or part, and kept secret.^{[23]}
Information theory
In 1948, the promised memorandum appeared as "A Mathematical Theory of Communication", an article in two parts in the July and October issues of the Bell System Technical Journal. This work focuses on the problem of how best to encode the message a sender wants to transmit. Shannon developed information entropy as a measure of the information content in a message, which is a measure of uncertainty reduced by the message. In so doing, he essentially invented the field of information theory.
The book The Mathematical Theory of Communication reprints Shannon's 1948 article and Warren Weaver's popularization of it, which is accessible to the nonspecialist. Weaver pointed out that the word "information" in communication theory is not related to what you do say, but to what you could say. That is, information is a measure of one's freedom of choice when one selects a message. Shannon's concepts were also popularized, subject to his own proofreading, in John Robinson Pierce's Symbols, Signals, and Noise.
Information theory's fundamental contribution to natural language processing and computational linguistics was further established in 1951, in his article "Prediction and Entropy of Printed English", showing upper and lower bounds of entropy on the statistics of English – giving a statistical foundation to language analysis. In addition, he proved that treating space as the 27th letter of the alphabet actually lowers uncertainty in written language, providing a clear quantifiable link between cultural practice and probabilistic cognition.
Another notable paper published in 1949 is "Communication Theory of Secrecy Systems", a declassified version of his wartime work on the mathematical theory of cryptography, in which he proved that all theoretically unbreakable ciphers must have the same requirements as the onetime pad. He is also credited with the introduction of sampling theory, which is concerned with representing a continuoustime signal from a (uniform) discrete set of samples. This theory was essential in enabling telecommunications to move from analog to digital transmissions systems in the 1960s and later.
He returned to MIT to hold an endowed chair in 1956.
Teaching at MIT
In 1956 Shannon joined the MIT faculty to work in the Research Laboratory of Electronics (RLE). He continued to serve on the MIT faculty until 1978.
Later life
Shannon developed Alzheimer's disease and spent the last few years of his life in a nursing home; he died in 2001, survived by his wife, a son and daughter, and two granddaughters.^{[24]}^{[25]}
Hobbies and inventions
Outside of Shannon's academic pursuits, he was interested in juggling, unicycling, and chess. He also invented many devices, including a Roman numeral computer called THROBAC, and juggling machines.^{[26]}^{[27]} He built a device that could solve the Rubik's Cube puzzle.^{[7]}
Shannon designed the Minivac 601, a digital computer trainer to teach business people about how computers functioned. It was sold by the Scientific Development Corp starting in 1961.^{[28]}
He is also considered the coinventor of the first wearable computer along with Edward O. Thorp.^{[29]} The device was used to improve the odds when playing roulette.
Personal life
Shannon married Norma Levor, a wealthy, Jewish, leftwing intellectual in January 1940. The marriage ended in divorce after about a year. Levor later married Ben Barzman.^{[30]}
Shannon met his second wife, Betty Shannon (née Mary Elizabeth Moore), when she was a numerical analyst at Bell Labs. They were married in 1949.^{[24]} Betty assisted Claude in building some of his most famous inventions.^{[31]} They had three children.^{[32]}
Shannon presented himself as apolitical and an atheist.^{[33]}
Tributes
There are six statues of Shannon sculpted by Eugene Daub: one at the University of Michigan; one at MIT in the Laboratory for Information and Decision Systems; one in Gaylord, Michigan; one at the University of California, San Diego; one at Bell Labs; and another at AT&T Shannon Labs.^{[34]} The statue in Gaylord is located in the Claude Shannon Memorial Park.^{[35]} After the breakup of the Bell System, the part of Bell Labs that remained with AT&T Corporation was named Shannon Labs in his honor.
According to Neil Sloane, an AT&T Fellow who coedited Shannon's large collection of papers in 1993, the perspective introduced by Shannon's communication theory (now called information theory) is the foundation of the digital revolution, and every device containing a microprocessor or microcontroller is a conceptual descendant of Shannon's publication in 1948:^{[36]} "He's one of the great men of the century. Without him, none of the things we know today would exist. The whole digital revolution started with him."^{[37]} The cryptocurrency unit shannon (a synonym for gwei) is named after him.^{[38]}
A Mind at Play, a biography of Shannon written by Jimmy Soni and Rob Goodman, was published in 2017.^{[39]}
On April 30, 2016, Shannon was honored with a Google Doodle to celebrate his life on what would have been his 100th birthday.^{[40]}^{[41]}^{[42]}^{[43]}^{[44]}^{[45]}
The Bit Player, a feature film about Shannon directed by Mark Levinson premiered at the World Science Festival in 2019.^{[46]} Drawn from interviews conducted with Shannon in his house in the 1980s, the film was released on Amazon Prime in August 2020.
The Mathematical Theory of Communication
Weaver's Contribution
Shannon's The Mathematical Theory of Communication,^{[47]} begins with an interpretation of his own work by Warren Weaver. Although Shannon's entire work is about communication itself, Warren Weaver communicated his ideas in such a way that those not acclimated to complex theory and mathematics could comprehend the fundamental laws he put forth. The coupling of their unique communicational abilities and ideas generated the ShannonWeaver model, although the mathematical and theoretical underpinnings emanate entirely from Shannon's work after Weaver's introduction. For the layman, Weaver's introduction better communicates The Mathematical Theory of Communication,^{[47]} but Shannon's subsequent logic, mathematics, and expressive precision was responsible for defining the problem itself.
Other work
Shannon's mouse
"Theseus", created in 1950, was a mechanical mouse controlled by an electromechanical relay circuit that enabled it to move around a labyrinth of 25 squares.^{[2]} The maze configuration was flexible and it could be modified arbitrarily by rearranging movable partitions.^{[2]} The mouse was designed to search through the corridors until it found the target. Having travelled through the maze, the mouse could then be placed anywhere it had been before, and because of its prior experience it could go directly to the target. If placed in unfamiliar territory, it was programmed to search until it reached a known location and then it would proceed to the target, adding the new knowledge to its memory and learning new behavior.^{[2]} Shannon's mouse appears to have been the first artificial learning device of its kind.^{[2]}
Shannon's estimate for the complexity of chess
In 1949 Shannon completed a paper (published in March 1950) which estimates the gametree complexity of chess, which is approximately 10^{120}. This number is now often referred to as the "Shannon number", and is still regarded today as an accurate estimate of the game's complexity. The number is often cited as one of the barriers to solving the game of chess using an exhaustive analysis (i.e. brute force analysis).^{[48]}^{[49]}
Shannon's computer chess program
On March 9, 1949, Shannon presented a paper called "Programming a Computer for playing Chess". The paper was presented at the National Institute for Radio Engineers Convention in New York. He described how to program a computer to play chess based on position scoring and move selection. He proposed basic strategies for restricting the number of possibilities to be considered in a game of chess. In March 1950 it was published in Philosophical Magazine, and is considered one of the first articles published on the topic of programming a computer for playing chess, and using a computer to solve the game.^{[48]}^{[50]}
His process for having the computer decide on which move to make was a minimax procedure, based on an evaluation function of a given chess position. Shannon gave a rough example of an evaluation function in which the value of the black position was subtracted from that of the white position. Material was counted according to the usual chess piece relative value (1 point for a pawn, 3 points for a knight or bishop, 5 points for a rook, and 9 points for a queen).^{[51]} He considered some positional factors, subtracting ½ point for each doubled pawn, backward pawn, and isolated pawn; mobility was incorporated by adding 0.1 point for each legal move available.
Shannon's maxim
Shannon formulated a version of Kerckhoffs' principle as "The enemy knows the system". In this form it is known as "Shannon's maxim".
Commemorations
Shannon centenary
The Shannon centenary, 2016, marked the life and influence of Claude Elwood Shannon on the hundredth anniversary of his birth on April 30, 1916. It was inspired in part by the Alan Turing Year. An ad hoc committee of the IEEE Information Theory Society including Christina Fragouli, Rüdiger Urbanke, Michelle Effros, Lav Varshney and Sergio Verdú,^{[52]} coordinated worldwide events. The initiative was announced in the History Panel at the 2015 IEEE Information Theory Workshop Jerusalem^{[53]}^{[54]} and the IEEE Information Theory Society newsletter.^{[55]}
A detailed listing of confirmed events was available on the website of the IEEE Information Theory Society.^{[56]}
Some of the planned activities included:
 Bell Labs hosted the First Shannon Conference on the Future of the Information Age on April 28–29, 2016, in Murray Hill, New Jersey, to celebrate Claude Shannon and the continued impact of his legacy on society. The event includes keynote speeches by global luminaries and visionaries of the information age who will explore the impact of information theory on society and our digital future, informal recollections, and leading technical presentations on subsequent related work in other areas such as bioinformatics, economic systems, and social networks. There is also a student competition
 Bell Labs launched a Web exhibit on April 30, 2016, chronicling Shannon's hiring at Bell Labs (under an NDRC contract with US Government), his subsequent work there from 1942 through 1957, and details of Mathematics Department. The exhibit also displayed bios of colleagues and managers during his tenure, as well as original versions of some of the technical memoranda which subsequently became well known in published form.
 The Republic of Macedonia is planning a commemorative stamp. A USPS commemorative stamp is being proposed, with an active petition.^{[57]}
 A documentary on Claude Shannon and on the impact of information theory, The Bit Player, is being produced by Sergio Verdú and Mark Levinson.
 A transAtlantic celebration of both George Boole's bicentenary and Claude Shannon's centenary that is being led by University College Cork and the Massachusetts Institute of Technology. A first event was a workshop in Cork, When Boole Meets Shannon,^{[58]} and will continue with exhibits at the Boston Museum of Science and at the MIT Museum.^{[59]}
 Many organizations around the world are holding observance events, including the Boston Museum of Science, the HeinzNixdorf Museum, the Institute for Advanced Study, Technische Universität Berlin, University of South Australia (UniSA), Unicamp (Universidade Estadual de Campinas), University of Toronto, Chinese University of Hong Kong, Cairo University, Telecom ParisTech, National Technical University of Athens, Indian Institute of Science, Indian Institute of Technology Bombay, Indian Institute of Technology Kanpur, Nanyang Technological University of Singapore, University of Maryland, University of Illinois at Chicago, École Polytechnique Federale de Lausanne, The Pennsylvania State University (Penn State), University of California Los Angeles, Massachusetts Institute of Technology, Chongqing University of Posts and Telecommunications, and University of Illinois at UrbanaChampaign.
 A logo that appears on this page was crowdsourced on Crowdspring.^{[60]}
 The Math Encounters presentation of May 4, 2016, at the National Museum of Mathematics in New York, titled Saving Face: Information Tricks for Love and Life, focused on Shannon's work in information theory. A video recording and other material are available.^{[61]}
Awards and honors list
The Claude E. Shannon Award was established in his honor; he was also its first recipient, in 1972.^{[62]}^{[63]}
 Stuart Ballantine Medal of the Franklin Institute, 1955^{[64]}
 Member of the American Academy of Arts and Sciences, 1957^{[65]}
 Harvey Prize, the Technion of Haifa, Israel, 1972^{[66]}
 Alfred Noble Prize, 1939 (award of civil engineering societies in the US)^{[67]}
 National Medal of Science, 1966, presented by President Lyndon B. Johnson^{[68]}
 Kyoto Prize, 1985^{[69]}
 Morris Liebmann Memorial Prize of the Institute of Radio Engineers, 1949^{[70]}
 United States National Academy of Sciences, 1956^{[71]}
 Medal of Honor of the Institute of Electrical and Electronics Engineers, 1966^{[72]}
 Golden Plate Award of the American Academy of Achievement, 1967^{[73]}
 Royal Netherlands Academy of Arts and Sciences (KNAW), foreign member, 1975^{[74]}
 Member of the American Philosophical Society, 1983^{[75]}
 Basic Research Award, Eduard Rhein Foundation, Germany, 1991^{[76]}
 Marconi Society Lifetime Achievement Award, 2000^{[77]}
 Donnor Professor of Science, MIT, 1958–1979^{[78]}
Selected works
 Claude E. Shannon: A Symbolic Analysis of Relay and Switching Circuits, master's thesis, MIT, 1937.
 Claude E. Shannon: "A Mathematical Theory of Communication", Bell System Technical Journal, Vol. 27, pp. 379–423, 623–656, 1948 (abstract).
 Claude E. Shannon and Warren Weaver: The Mathematical Theory of Communication. The University of Illinois Press, Urbana, Illinois, 1949. ISBN 0252725484
See also
 Entropy power inequality
 Errorcorrecting codes with feedback
 List of pioneers in computer science
 Models of communication
 ngram
 Noisy channel coding theorem
 Nyquist–Shannon sampling theorem
 Onetime pad
 Product cipher
 Pulsecode modulation
 Rate distortion theory
 Sampling
 Shannon capacity
 Shannon entropy
 Shannon index
 Shannon multigraph
 Shannon security
 Shannon switching game
 Shannon–Fano coding
 Shannon–Hartley law
 Shannon–Hartley theorem
 Shannon's expansion
 Shannon's source coding theorem
 ShannonWeaver model of communication
 Whittaker–Shannon interpolation formula
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Further reading
 Rethnakaran Pulikkoonattu — Eric W. Weisstein: Mathworld biography of Shannon, Claude Elwood (1916–2001) Shannon, Claude Elwood (1916–2001) – from Eric Weisstein's World of Scientific Biography
 Claude E. Shannon: Programming a Computer for Playing Chess, Philosophical Magazine, Ser.7, Vol. 41, No. 314, March 1950. (Available online under External links below)
 David Levy: Computer Gamesmanship: Elements of Intelligent Game Design, Simon & Schuster, 1983. ISBN 0671495321
 Mindell, David A., "Automation's Finest Hour: Bell Labs and Automatic Control in World War II", IEEE Control Systems, December 1995, pp. 72–80.
 Poundstone, William, Fortune's Formula, Hill & Wang, 2005, ISBN 9780809045990
 Gleick, James, The Information: A History, A Theory, A Flood, Pantheon, 2011, ISBN 9780375423727
 Jimmy Soni and Rob Goodman, A Mind at Play: How Claude Shannon Invented the Information Age, Simon and Schuster, 2017, ISBN 9781476766683
 Nahin, Paul J., The Logician and the Engineer: How George Boole and Claude Shannon Create the Information Age, Princeton University Press, 2013, ISBN 9780691151007
 Everett M. Rogers, Claude Shannon's Cryptography Research During World War II and the Mathematical Theory of Communication, 1994 Proceedings of IEEE International Carnahan Conference on Security Technology, pp. 1–5, 1994. Claude Shannon's cryptography research during World War II and the mathematical theory of communication
External links
 Guide to the Claude Elwood Shannon papers at the Library of Congress
 A Public Lecture Celebrating Claude E. Shannon – Sergio Verdu, Institute for Advanced Study on YouTube
 Claude Elwood Shannon (1916–2001) at the Notices of the American Mathematical Society