Jørn Jensen

Danish computer programmer

Jørn Jensen
Born	1925 (1925) Denmark
Died	2007 (aged 81–82)
Nationality	Danish
Occupation	Computer programmer
Years active	1956–2005
Known for	Much pioneering computer programming in Denmark
Notable work	DASK programs ALGOL 60 compilers

Jørn Jensen (1925 – 2007) was one of the earliest Danish computer programmers. Examined as a mechanical engineer, he had worked with electromechanical construction. In 1958, he was employed at the Danish Regnecentralen (RC), and very soon exhibited an extraordinary programming skill. He developed the main parts of the base programs to the Dansk Aritmetisk Sekvens Kalkulator (DASK, Danish Arithmetic Sequence Calculator), the first Danish computer. Among other programs, he designed a set of monitor programs to supervise the program running schedule on DASK. In tight collaboration with Peter Naur and others, he developed reliable, well documented compilers for the ALGOL 60 programming language.^[1] In this context, he invented Jensen's Device, an ingenious exploitation of the name parameters to compute numerical series without using procedure parameters, as is needed in all programming languages, except ALGOL 60 and Simula 67.

After some 20 years at Regnecentralen, he continued his career in systems programming, and other types, at the Brown, Boveri & Cie electrical engineering company.

References

^ Daylight, Edgar G. (2005). "Peter Naur: A. M. Turing Award". ACM Awards. Association for Computing Machinery. Archived from the original on 12 February 2008. Retrieved 10 November 2020. Mentions Naur's work with Jensen on GIER ALGOL.

ALGOL programming

Implementations

Technical standards	ALGOL 58 ALGOL 60 ALGOL 68
Dialects	ABC ALGOL ALCOR ALGO ALGOL 68C ALGOL 68-R ALGOL 68RS (ELLA) ALGOL 68S ALGOL N ALGOL W ALGOL X Atlas Autocode (Edinburgh IMP) Burroughs ALGOL CORAL 66 Dartmouth ALGOL 30 DASK ALGOL DG/L Elliott ALGOL Executive Systems Problem Oriented Language (ESPOL) → New Executive Programming Language (NEWP) FLACC IMP JOVIAL Kidsgrove Algol MAD Mary NELIAC RTL/2 S-algol, PS-algol, Napier88 Simula Small Machine ALGOL Like Language (SMALL) SMIL ALGOL
Formalisms	Jensen's device Van Wijngaarden grammar

Community

Organizations

Professional associations	ALCOR Group Association for Computing Machinery (ACM) BSI Group Euro-Asian Council for Standardization, Metrology and Certification (EASC) International Federation for Information Processing (IFIP) IFIP Working Group 2.1 Society of Applied Mathematics and Mechanics (GAMM)
Business	Burroughs Corporation Elliott Brothers Regnecentralen
Education	Case Institute of Technology University of Edinburgh University of St Andrews Manchester University Massachusetts Institute of Technology (MIT)
Government	Royal Radar Establishment (RRE)

People

ALGOL 58

John Backus Friedrich L. Bauer Hermann Bottenbruch Charles Katz Alan Perlis Heinz Rutishauser Klaus Samelson Joseph Henry Wegstein
MAD	Bruce Arden Bernard Galler Robert M. Graham