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László Bélády the editor-in-chief of the IEEE Transactions on Software Engineering in the 1980s.

Memory Caching Algorithm

Hungarians

Richard Stallman, created the GNU system utilities and championed free software.

Emacs

American

Entity–Relationship Model

Edsger W. Dijkstra developed the framework for a form of structured programming.

Distributed Computing

Structured Programming

Dutch

Fred Brooks best known for managing the development of 

OS/360

Charles Bachman is particularly known for his work in the area of 

Integrated Data Store

Modular Programming

Canadian

Michael A. Jackson software engineering methodologist responsible for JSP method of program design; JSD method of system development (with John Cameron); and Problem Frames approach for analysing and structuring software development problems.