April 1926 - March 2011
Working to make electronic communications bulletproof at the height of the Cold War, Paul Baran developed what would eventually become a core technology of the Internet: packet switching. Baran was a researcher at the Rand Corp. think tank in 1961 when he suggested that messages could be broken into pieces, sent to a destination by multiple routes if necessary and then reassembled upon arrival to guarantee delivery.
Baran wasn't the only one to think of the idea -- U.K. researcher Donald Davies came up with a remarkably similar idea at about the same time and gave it the name "packet switching." But the U.S. Air Force liked Baran's version of what was essentially an inexpensive, unreliable network with intelligence at the edges. AT&T, the dominant U.S. telephone company, didn't -- it had an expensive, reliable network, and company engineers publicly scoffed at Baran's idea.
However, packet switching was adopted for Arpanet, the predecessor to the Internet, and eventually for local-area networks in the form of Ethernet. Today, even phone calls are typically sent in digital packets. (This hour-long video interview shows Paul Baran receiving a 2005 Computer History Museum Fellow Award.)
Last of the First Programmers
December 1924 - March 2011
Jean Bartik was the last surviving member of the original programming team for the ENIAC, the first general-purpose electronic computer. But that understates her work. Bartik, the only female math graduate in her 1945 college class, was hired to make the physical connections that let the ENIAC perform artillery calculations, and she served as a lead programmer on the project. But Bartik also developed circuit logic and did design work under the direction of ENIAC's hardware developer, J. Presper Eckert.
After ENIAC, Bartik followed Eckert to work on both hardware and software for the commercial Univac I mainframe and the specialized BINAC (Binary Automatic Computer). But once the Univac was complete, Bartik retired at age 26 in 1951 to raise a family. She returned to a much-changed IT industry in 1967 and worked as an editor at several analyst companies until she was laid off in 1985, when she was in her 60s.