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Ole Johan Dahl

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Fields
  
Computer Science

Name
  
Ole-Johan Dahl


Role
  
Computer scientist

Education
  
Ole-Johan Dahl Legacy

Born
  
12 October 1931Mandal, Norway (
1931-10-12
)

Institutions
  
Norwegian Computing CenterUniversity of Oslo

Notable awards
  
Died
  
June 29, 2002, Oslo, Norway

Books
  
Structured Programming, Common base language

Awards
  
Turing Award, IEEE John von Neumann Medal

Similar People
  
Kristen Nygaard, Tony Hoare, Edsger W Dijkstra

Ole-Johan Dahl (12 October 1931 – 29 June 2002) was a Norwegian computer scientist. Dahl was a professor of computer science at the University of Oslo and is considered to be one of the fathers of Simula and object-oriented programming along with Kristen Nygaard.

Contents

Ole-Johan Dahl wwwmnuionoifienglishaboutolejohandahlole

Career

Ole-Johan Dahl OleJohan Dahl og gjkungen p Matematisk institutt

Dahl was born in Mandal, Norway. He was the son of Finn Dahl (1898-1962) and Ingrid Othilie Kathinka Pedersen (1905-80). When he was seven, his family moved to Drammen. When he was thirteen, the whole family fled to Sweden during the Occupation of Norway by Nazi Germany. After the end of the war, Dahl studied numerical mathematics at the University of Oslo.

Ole-Johan Dahl Dahlschooluniformjpg

Dahl became a full professor at the University of Oslo in 1968 and was a gifted teacher as well as researcher. Here he worked on Hierarchical Program Structures, probably his most influential publication, which appeared co-authored with C.A.R. Hoare in the influential book Structured Programming of 1972 by Dahl, Edsger Dijkstra and Hoare, perhaps the best-known academic book concerning software in the 1970s. As his career progressed, Dahl became increasingly interested in the use of formal methods, to rigorously reason about object-orientation for example. His expertise ranged from the practical application of ideas to their formal mathematical underpinning to ensure the validity of the approach.

Ole-Johan Dahl dahlnygaardjpg

Dahl is widely accepted as Norway’s foremost computer scientist. With Kristen Nygaard, he produced the initial ideas for object-oriented (OO) programming in the 1960s at the Norwegian Computing Center (NR) as part of the Simula I (1961–1965) and Simula 67 (1965–1968) simulation programming languages. Dahl and Nygaard were the first to develop the concepts of class, subclass (allowing implicit information hiding), inheritance, dynamic object creation, etc., all important aspects of the OO paradigm. An object is a self-contained component (with a data structure and associated procedures or methods) in a software system. These are combined to form a complete system. The object-oriented approach is now pervasive in modern software development, including widely used imperative programming languages such as Java and C++.

He received the Turing Award for his work in 2001 (with Kristen Nygaard). He received the 2002 IEEE John von Neumann Medal (with Kristen Nygaard) and was named Commander of the Royal Norwegian Order of St. Olav in 2000.

Early papers

  • Multiple index countings on the Ferranti Mercury computer / by O.-J. Dahl. Oslo: Norwegian Defence Research Establishment, 1957.
  • Programmer's handbook for the Ferranti Mercury Computer, Frederic at the Norwegian Defense Research Establishment / By O.-J. Dahl, and Jan V. Garwick. – 2nd ed., Kjeller: Norwegian Defence Research Establishment, 1958.
  • Automatisk kodning: et prosjekt ved Forsvarets forskningsinstitutt.
  • Simscript implementation / by Vic Bell and Ole-Johan Dahl. Oslo: Norwegian Computing Center, 1963.
  • Basic concepts of SIMULA: an ALGOL based simulation language / by Ole-Johan Dahl and Kristen Nygaard. Oslo: Norsk Regnesentral, [1965?].
  • SIMULA: a language for programming and description of discrete event systems : introduction and user's manual. Oslo: Norsk Regnesentral, 1965.
  • Discrete event simulation languages: lectures delivered at the NATO summer school, Villard-de-Lans, September 1966 / by Ole-Johan Dahl. Oslo: Norsk Regnesentral/Norwegian Computing Center, 1966.
  • SIMULA: an ALGOL based simulation language / by Ole-Johan Dahl and Kristen Nygaard. Oslo: Norsk Regnesentral, 1966.
  • Simula: an ALGOL-based simulation language / Ole-Johan Dahl and Kristen Nygaard. New York: Association for Computing Machinery, 1966. I: Communications of the ACM; 9(1966).
  • Class and subclass declarations / Ole-Johan Dahl and Kristen Nygaard. Amsterdam: North-Holland, c1968. I: Simulation programming languages: proceedings of the IFIP working conference on simulation programming languages, Oslo, May 1967 / O.-J. Dahl, conference chairman; organized by IFIP Technical Committee 2, programming languages; edited by J.N. Buxton.
  • Discrete event simulation languages / Ole-Johan Dahl. London: Academic Press, 1968. (Programming languages : NATO Advanced Study Institute / edited by G. Genuys.)
  • SIMULA 67: common base language / by Ole-Johan Dahl, Bjørn Myhrhaug and Kristen Nygaard. Oslo: Norsk Regnesentral, 1968. (Publication S / Norwegian Computing Center; 2) Rev. 1970: Common base language (Publ.; 22).
  • References

    Ole-Johan Dahl Wikipedia