Paul "Pesach" Baran

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Paul "Pesach" Baran

Birthdate: (84)
Birthplace: Grodno, Bialystok Province, Poland
Death: March 26, 2011 (84)
Immediate Family:

Son of Private and Private
Husband of Evelyn Baran
Father of Private
Brother of Harriet Goldin and Herbert Baran

Managed by: Private User
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Immediate Family

About Paul "Pesach" Baran

Paul Baran (April 29, 1926 – March 26, 2011) was a Polish-American engineer who was a pioneer in the development of computer networks. He was one of the two independent inventors of packet switched computer networking,[1] and went on to start several companies and develop other technologies that are an essential part of the Internet and other modern digital communication.

Contents [show] Early life[edit] Paul Baran was born in Grodno, Second Polish Republic (now part of Belarus) on April 29, 1926.[2][3] He was the youngest of three children in a Jewish family,[4] with the Yiddish given name "Pesach". His family moved to the United States on May 11, 1928,[5] settling in Boston and later in Philadelphia, where his father, Morris "Moshe" Baran (1884–1979), opened a grocery store. He graduated from Drexel University in 1949 (then called Drexel Institute of Technology), with a degree in electrical engineering. He then joined the Eckert-Mauchly Computer Company, where he did technical work on UNIVAC models, the first brand of commercial computers in the USA.[6] In 1955 he married Evelyn Murphy, moved to Los Angeles, and worked for Hughes Aircraft on radar data processing systems. He obtained his Masters degree in engineering from UCLA in 1959, with advisor Gerald Estrin while taking night classes. His thesis was on character recognition.[2]While Baran initially stayed on at UCLA to pursue his doctorate, a heavy travel and work schedule forced him to abandon his doctoral work.[7]

Packet switched network design[edit] After joining the RAND Corporation in 1959, Baran took on the task of designing a "survivable" communications system that could maintain communication between end points in the face of damage from nuclear weapons.[8] At the time of the Cold War, most American military communications used high frequency connections which could be put out of action for many hours by a nuclear attack. Baran decided to automate RAND director Franklin R. Collbohm's previous work with emergency communication over conventional AM radio networks and showed that a distributed relay node architecture could be survivable. The Rome Air Development Center soon showed that the idea was practicable.[9]

Using the mini-computer technology of the day, Baran and his team developed a simulation suite to test basic connectivity of an array of nodes with varying degrees of linking. That is, a network of n-ary degree of connectivity would have n links per node. The simulation randomly 'killed' nodes and subsequently tested the percentage of nodes that remained connected. The result of the simulation revealed that networks where n ≥ 3 had a significant increase in resilience against even as much as 50% node loss. Baran's insight gained from the simulation was that redundancy was the key.[10] His first work was published a RAND report in 1960,[11] with more papers generalizing the techniques in the next two years.[12]

After proving survivability Baran and his team needed to show proof of concept for this design such that it could be built. This involved high level schematics detailing the operation, construction, and cost of all the components required to construct a network that leveraged this new insight of redundant links. The result of this was one of the first store-and-forward data layer switching protocols, a link-state/distance vector routing protocol, and an unproved connection-oriented transport protocol. Explicit detail of these designs can be found in the complete series of reports "On Distributed Communications", published by RAND in 1964.[13]

The design flew in the face of telephony design of the time, placing inexpensive and unreliable nodes at the center of the network, and more intelligent terminating 'multiplexer' devices at the endpoints. In Baran's words, unlike the telephone company's equipment, his design didn't require expensive "gold plated" components to be reliable. This Distributed Network that Baran introduced was intended to route around damage. It provided connection to others through many points, not one centralized connection. Fundamental to this scheme was the division of the information into "blocks" before sending them out across the network. This enabled the data to travel faster and communications lines to be used more efficiently. Each block was sent separately, traveling through different paths and finally rejoined into a whole when they were received at their destination.

Selling the idea[edit] After the publication of "On Distributed Communications'", Paul Baran presented the findings of his team to a number of audiences, including AT&T engineers (not to be confused with Bell Labs engineers, who at the time provided Paul Baran with the specifications for the first generation of T1 circuit which he used as the links in his network design proposal). In subsequent interviews Baran mentioned how the AT&T engineers scoffed at his idea of non-dedicated physical circuits for voice communications, at times claiming that Baran simply did not understand how voice telecommunication worked.[14]

Donald Davies at the National Physical Laboratory in the United Kingdom also thought of the same idea[2][15] and implemented a trial network. While Baran used the term "message blocks" for his units of communication, Davies used the term "packets" as it was capable of being translated into languages other than English without compromise.[16] He applied the concept to a general-purpose computer network. Davies' key insight came in the realization that computer network traffic was inherently "bursty" with periods of silence, compared with relatively constant telephone traffic. Baran was happy to acknowledge that Davies had come up with the same idea as him quite separately. In an e-mail to Davies he wrote

You and I share a common view of what packet switching is all about, since you and I independently came up with the same ingredients.[17]

Leonard Kleinrock, a contemporary working on analyzing data flow, also reached similar conclusions when he developed a theoretical basis for the operation of packet networks in his proposal for a Ph.D. thesis in 1961. He published his ideas in that year.[18]

In 1969, when the US Defense Advanced Research Projects Agency (ARPA) started developing the idea of an inter-networked set of terminals to share computing resources, the reference materials which they considered included Baran and the RAND Corporation's "On Distributed Communications" volumes.[2] The resiliency of a packet-switched network that uses link-state routing protocols used on the Internet stems in some part from the research to develop a network that could survive a nuclear attack.[2][19]

Later work[edit] In 1968 Baran was a founder of the Institute for the Future, and then involved in other networking technologies developed in Silicon Valley. He participated in a review of the NBS proposal for a Data Encryption Standard in 1976, along with Martin Hellman and Whitfield Diffie of Stanford University.[20] In the early 1980s, Baran founded PacketCable, Inc, "to support impulse-pay television channels, locally generated videotex, and packetized voice transmission".[21][22] PacketCable (also known as Packet Technologies) spun off StrataCom to commercialize his packet voice technology for the telephony market. This technology led to the first commercial pre-standard Asynchronous Transfer Mode product. He founded Telebit after conceiving its discrete multitone modem technology in the mid-1980s. This was one of the first commercial products to use Orthogonal frequency-division multiplexing, which was later widely deployed in DSL modems and Wi-Fi wireless modems. In 1985, Baran founded Metricom, the first wireless Internet company, which deployed Ricochet,[3] the first public wireless mesh networking system. In 1992, he also founded Com21, an early cable modem company.[6] Following Com21, Baran founded and was president of GoBackTV, which specializes in personal TV and cable IPTV infrastructure equipment for television operators.[23] Most recently he founded Plaster Networks, providing an advanced solution for connecting networked devices in the home or small office through existing wiring.[24]

Baran extended his work in packet switching to wireless-spectrum theory, developing what he called "kindergarten rules" for the use of wireless spectrum.[25]

In addition to his innovation in networking products, he is also credited with inventing the first doorway gun detector.[6][26]

He received an honorary doctorate when he gave the commencement speech at Drexel in 1997.[27]

Death[edit] Baran died in Palo Alto, California at the age of 84 on March 26, 2011,[2][28] due to complications from lung cancer.[19] Upon his death James Thomson, the president of RAND, stated that "Our world is a better place for the technologies Paul Baran invented and developed, and also because of his consistent concern with appropriate public policies for their use."[28] One of the fathers of the internet, Vinton Cerf, stated that "Paul wasn't afraid to go in directions counter to what everyone else thought was the right or only thing to do."[19] According to Paul Saffo, Baran also believed that innovation was a "team process" and he didn't seek credit for himself.[26] On hearing news of his death, Robert Kahn, co-inventor of the Internet, said: "Paul was one of the finest gentlemen I ever met and creative to the very end."

Awards and honors[edit] IEEE Alexander Graham Bell Medal (1990)[29] Marconi Prize (1991) Nippon Electronics Corporation C&C Prize (1996) Bower Award and Prize for Achievement in Science (2001)[6] Fellow of the American Academy of Arts and Sciences (2003)[30] Fellow of the Computer History Museum (2005) "for fundamental contributions to the architecture of the internet and for a lifetime of entrepreneurial activity." National Inventors Hall of Fame (2007) National Medal of Technology and Innovation (2007)[31] UCLA Engineering Alumnus of the Year (2009)[32] Internet Hall of Fame (2012)[33]

Baran suggested distributed network—"a communication network which will allow several hundred major communications stations to talk with one another after an enemy attack. " (Baran, Rand Memorandum 3420-PR, CH.1) A distributed network would have no centralized switch. Each node would be connected to several of its neighboring nodes in a sort of lattice-like configuration. Therefore, each node would have several possible routes to send data. If one route or neighboring node was destroyed, another path would be available.

Baran's other ground-breaking idea was to divide messages into "message blocks" before sending them out across the network. Each block would be sent separately and rejoined into a whole when they were received at their destination. A British man named Donald Davies independently devised a very similar system, but he called the message blocks "packets," a term that was eventually adopted instead of Baran's message blocks.

Packets allowed for a very efficient way to transmit data. Data communications are by nature very "bursty." Information is sent in bursts, not continuously. Traditional communications networks employed dedicated lines. Telephone networks provide a good example. When a call is made a line is dedicated to that call. No other use can be made of that line while the call is in progress. If there is a pause in the conversation, no data is being transmitted, but the line is still in use and unavailable. This represents a waste in capacity (bandwidth).

Baran envisioned a network of unmanned nodes that would act as switches routing packets from one node to another to their final destinations. The nodes would use a scheme he called "hot potato routing." (Baran, Rand Memorandum 3103-PR, Ch.2) This method is a rapid store-and-forward design.

Paul Baran died March 26, 2011

Wife's maiden name was Evelyn Murphy.

--Family see Documents in Media Tab.

For info on him, as long as link works, can see:

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Paul "Pesach" Baran's Timeline

April 29, 1926
Grodno, Bialystok Province, Poland

--SSDI has Paul Baran -- b: 29 Apr 1926 -- d: 26 Mar 2011 -- Last Res.: 94304 Palo Alto, Santa Clara, CA

--1928 NY Arrival has as Baran Psachija -- Age 2 -- born "Gwetno" Poland

[Data Conflict from Merge -- First Name: LL just had Paul, DS had "Paul "Pesach"";
Birth Location: LL just had Poland, DS had Grodno, Bialystok Province, Poland ]

For Paul: --1928 NY Arrival has as Baran Psachija -- Age 2 -- born "Gwetno" Poland

March 26, 2011
Age 84

--The News Obit from the NY Times included as Document for Family.

--"Featured Memorial" from includes "Baran's wife since 1955 Evelyn died in 2007. He is survived by his son, of Atherton, Calif., and three grandchildren" - See more at:

--SSDI has Paul Baran -- b: 29 Apr 1926 -- d: 26 Mar 2011 -- Last Res.: 94304 Palo Alto, Santa Clara, CA -- SSN issued: PA (before 1951)