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Jean Ichbiah

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Jean David Ichbiah was a highly influential French and American computer scientist. He is best known for his work in creating programming languages. A programming language is a specific set of rules used to give instructions to a computer. Ichbiah's work helped ensure that complex computer systems could operate reliably. His most famous achievement was serving as the chief designer of Ada. Ada is a general-purpose, strongly typed programming language. This means the language has strict rules to prevent errors during coding.

Ichbiah's journey into advanced computing began with several experimental projects. From 1972 to 1974, he worked on an experimental system implementation language called LIS. This language was built using concepts from two other languages, Pascal and Simula. During this time, he also served as the chairman of the Simula User's Group. He was a founding member of IFIP WG 2.4, which focused on systems implementation languages. These early roles helped him master the foundations of how software communicates with hardware.

After his work on LIS, Ichbiah joined the company CII Honeywell Bull in Louveciennes, France. He became a member of the Programming Research division. While there, he worked on several major technical projects. He helped rewrite the Siris 7 operating system into the newer Siris 8 version. He also worked on the CII Iris 80, which was a mainframe computer. A mainframe is a large, powerful computer used by big organizations. This experience with large-scale systems prepared him for his work with the United States Department of Defense.

In 1978, Ichbiah led a team that entered a major competition. The United States Department of Defense needed a new embedded programming language. Embedded programming languages are used to control specific hardware inside devices. Ichbiah's team submitted a design called "Green." The Department of Defense selected Green as the winner. Following this selection, Ichbiah continued as the chief designer. The language was then renamed Ada. He led the effort to standardize the language into what became known as Ada 83.

To support his work on Ada, Ichbiah founded a company called Alsys in 1980. He established the corporation in La Celle-Saint-Cloud, France. Alsys focused on defining the Ada language and creating validated compilers. A compiler is a special program that translates human-readable code into machine code. These compilers were so reliable that they were supplied to major organizations. This included NASA, the US Army, and other large entities. In July 1995, Alsys merged with Thomson Software Products. This company later merged into Aonix in 1996.

Ichbiah's innovation extended into how humans interact with mobile technology. In the 1990s, he designed a keyboard layout called FITALY. This layout was specifically optimized for stylus or touch-based input. This was important for the early development of handheld devices. He later started a company called Textware Solutions. This company sells text entry software for Personal Digital Assistants (PDAs) and tablet PCs. They also provide software used for medical transcription on personal computers.

Throughout his career, Ichbiah received many prestigious honors for his scientific contributions. In 1979, he was named a chevalier, or knight, of the French Legion of Honour. He also became a correspondent of the French Academy of Sciences. The United States Department of Defense gave him a Certificate of Distinguished Service for his work on Ada. These awards recognized his massive impact on the field of computer science. Ichbiah passed away on January 26, 2007, due to complications from a brain tumor. His legacy lives on through the languages and tools he built.

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