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Ole-Johan Dahl

Ole-Johan Dahl. ACM Turing Award (2001) Presentation by Carsten Hood CSCE 221-200 | Spring 2014. Life | Ole-Johan Dahl. Born in Norway in 1931 Received his MS in Numerical Mathematics at the University of Oslo in 1957

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Ole-Johan Dahl

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  1. Ole-Johan Dahl ACM Turing Award (2001) Presentation by Carsten Hood CSCE 221-200 | Spring 2014

  2. Life | Ole-Johan Dahl • Born in Norway in 1931 • Received his MS in Numerical Mathematicsat the University of Oslo in 1957 • In 1952 began mandatory military service at the Norwegian Defense Research Establishment and was introduced to computers and Kristen Nygaard. • Joined the Norwegian Computing Center from 1963 to 1968 • Became a full professor at the University of Oslo in 1968

  3. Partnership with Kristen Nygaard • Dahl immediately befriended fellow Norwegian computer scientist Kristen Nygaard at the Defense Establishment. • This relationship combined two intelligent minds with different backgrounds • Together they developed the SIMULA programming language. • They remained lifelong friends and partners. Without the unique brilliance of this partnership, the concepts of object-oriented programming may have taken much longer to emerge.

  4. The SIMULA Language • Based on the well-known language ALGOL 60 • First object-oriented programming language • Intended as a means of writing simulation programs for the military and industry. • Generalized in SIMULA 67 • Originated the concepts of objects, classes, inheritance, and modularity • Included virtual methods, active objects, action combination, processes & schedulers, frameworks, automatic memory management & garbage collection • SIMULA 67 was an ancestor of C++, C#, Smalltalk, and Java

  5. Contributions | Ole-Johan Dahl • Considered a co-founder of object-oriented programming • Singlehandedly developed the computer science college at the University of Oslo • As a professor researched systems of reasoning mathematically about OO systems and computer programming • Contributed to the important book Structured Programming, published in 1972 • Later helped to develop the Advanced Boolean Expression Language (ABEL)

  6. Legacy | Ole-Johan Dahl • Remained loyal to his country and alma mater throughout his life. • Helped invent one of the most important programming paradigms • Known for his modesty; attributed much of his revolutionary ideas to luck • Received the Turing Award with Kristen Nygaardfor his work on SIMULA and object-oriented programming in 2001 • Ole-Johan Dahl passed away the summer of 2002. His colleague EdsgerDijkstra died the next week; partner Kristen Nygaarddied the week after.

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