Donald Watts Davies CBE FRS (June 7, 1924 – May 28, 2000) was a Welsh computer scientist who was a co-inventor of packet switching (and originator of the term), along with Paul Baran in the US. Events 1099 - The First Crusade: The Siege of Jerusalem begins Year 1924 ( MCMXXIV) was a Leap year starting on Tuesday (link will display the full calendar of the Gregorian calendar. Events 585 BC - A Solar eclipse occurs as predicted by Greek philosopher and scientist Thales, while Alyattes is battling 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. A computer scientist is a person that has acquired knowledge of Computer science, the study of the theoretical foundations of information and computation and their application Packet switching is a network communications method that splits data traffic (digital representations of text sound or video data into chunks called packets, that are then Paul Baran (born April 29, 1926) was one of the three inventors of Packet-switched networks along with Donald Davies and Leonard Kleinrock The United States of America —commonly referred to as the
Davies was born in Treorchy in the Rhondda Valley, Wales. Treorchy (Treorci is a Village, although it used to be and still has characteristics of a Town, in the County borough of Rhondda Cynon Taff He received BSc degrees in physics (1943) and mathematics (1947) at Imperial College London. A Bachelor of Science ( BS, BSc or BSc in the UK; less commonly S Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. Year 1943 ( MCMXLIII) was a Common year starting on Friday (the link will display full 1943 calendar of the Gregorian calendar. Mathematics is the body of Knowledge and Academic discipline that studies such concepts as Quantity, Structure, Space and Year 1947 ( MCMXLVII) was a Common year starting on Wednesday (link will display full 1947 calendar of the Gregorian calendar. Imperial College London (officially The Imperial College of Science Technology and Medicine as given in its Royal Charter It is one of only three universities to have reached In 1955, he married Diane Burton. Year 1955 ( MCMLV) was a Common year starting on Saturday (link displays the 1955 Gregorian calendar)
He worked at the National Physical Laboratory at Teddington just outside London. The National Physical Laboratory (NPL is the national Measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington Teddington is in London, England on the north bank of the River Thames, between Hampton Wick and Twickenham. London ( ˈlʌndən is the capital and largest urban area in the United Kingdom. From 1947, he worked with Alan Turing on the Pilot ACE computer and indeed spotted mistakes in Turing's seminal 1936 paper On Computable Numbers, much to Turing's annoyance. Year 1947 ( MCMXLVII) was a Common year starting on Wednesday (link will display full 1947 calendar of the Gregorian calendar. Alan Mathison Turing, OBE, FRS (ˈt(jʊ(ərɪŋ (23 June 1912 &ndash 7 June 1954 was an English Mathematician The Pilot ACE was one of the first Computers built in the United Kingdom, at the National Physical Laboratory (NPL in the early 1950s Year 1936 ( MCMXXXVI) was a Leap year starting on Wednesday (link will display the full calendar of the Gregorian calendar. These were perhaps some of the first "programming" errors in existence, even if they were for a theoretical computer, the universal Turing machine. This article is a supplement to the article Turing machine. Alan Turing 's "universal computing machine" (alternately "universal He headed the NPL Autonomic Division from 1966 and worked on computer network security from the late 1970s. Year 1966 ( MCMLXVI) was a Common year starting on Saturday (link will display full calendar of the 1966 Gregorian calendar. This article describes how security can be achieved through design and engineering This article is about the Decade 1970-1979 For the Year 1970 see 1970.
In 1970, Davies helped build a packet switched network called the Mark I to serve the NPL in the UK. It was replaced with the Mark II in 1973, and remained in operation until 1986, influencing other research in the UK and Europe. 
Davies was appointed a CBE in 1983 and a Fellow of the Royal Society in 1987. The Most Excellent Order of the British Empire is a British Order of chivalry established on 4 June 1917 by King George V. Year 1983 ( MCMLXXXIII) was a Common year starting on Saturday (link displays the 1983 Gregorian calendar) The Royal Society of London for the Improvement of Natural Knowledge, known simply as The Royal Society, is a Learned society for science that was founded in 1660 Year 1987 ( MCMLXXXVII) was a Common year starting on Thursday (link displays 1987 Gregorian calendar)