Raymond Samuel Tomlinson (April 23, 1941 – March 5, 2016) was an American computer programmer who implemented the first email program on the ARPANET system, the precursor to the Internet, in 1971; It was the first system able to send mail between users on different hosts connected to ARPANET. Previously, mail could be sent only to others who used the same computer. To achieve this, he used the @ sign to separate the user name from the name of their machine, a scheme which has been used in email addresses ever since. The Internet Hall of Fame in its account of his work commented "Tomlinson's email program brought about a complete revolution, fundamentally changing the way people communicate." He is credited with the invention of the TCP three-way handshake which underlies HTTP and many other key Internet protocols. Early life and education Tomlinson was born in Amsterdam, New York, but his family soon moved to the small, unincorporated village of Vail Mills, Broadalbin, New York. He attended Broadalbin Central School in nearby Broadalbin, New York. Later he attended Rensselaer Polytechnic Institute (RPI) in Troy, New York where he participated in the co-op program with IBM. He received a bachelor's degree in electrical engineering from RPI in 1963. After graduating from RPI, he entered the Massachusetts Institute of Technology (MIT) to continue his electrical engineering education. At MIT, Tomlinson worked in the Speech Communication Group and developed an analog-digital hybrid speech synthesizer as the subject of his thesis for the master's degree in electrical engineering, which he received in 1965.'Career In 1967, he joined the technology company of Bolt, Beranek and Newman (now BBN Technologies), where he helped develop the TENEX operating system including the ARPANET Network Control Program, implementations of Telnet, and implementations on the self-replicating programs Creeper and Reaper. He wrote a file transfer program called CPYNET to transfer files through the ARPANET. Tomlinson was asked to change a program called SNDMSG, which sent messages to other users of a time-sharing computer, to run on TENEX. He added code he took from CPYNET to SNDMSG so messages could be sent to users on other computers—the first email. The first email Tomlinson sent was a test. It was not preserved and Tomlinson describes it as insignificant, something like "QWERTYUIOP." This is commonly misquoted as "The first e-mail was QWERTYUIOP." Tomlinson later commented that these "test messages were entirely forgettable and