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Michael A. Harrison

American computer scientist

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About Michael A. Harrison

Michael A. Harrison was an American computer scientist, known for Formal language theory and Harrison-Ruzzo-Ullman model.

Michael A. Harrison (

In the 1960s, he worked with Sheila Greibach, Gene Rose, Ed Spanier, and Joe Ullian in a research group formed and led by Seymour Ginsburg, dedicated to formal language theory and the foundations of Computer Science. The work that came out of this group distinguished Computer Science theory from other fields. It also brought the field of formal language theory to bear on programming language research.

In 1975, he developed the HRU security model (named after its authors Harrison, Ruzzo, Ullman), an operating system level computer security model dealing with the integrity of access rights in the system.

With his Ph.D. student Pehong Chen at Berkeley, he founded the "Gain Technology" company (acquired by Sybase in 1992).

After retirement in 1994, he served as professor emeritus and also professor in the graduate school at Berkeley.

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Important facts

Born
Philadelphia
Occupation
Nationality
Known for
Formal language theory, Harrison-Ruzzo-Ullman model
Education
University of California, Berkeley, University of Michigan
Employers
University of California, Berkeley
Awards
Guggenheim Fellowship; ACM Fellow

Frequently asked questions

Who was Michael A. Harrison?

American computer scientist

When was Michael A. Harrison born?

Michael A. Harrison was born in Philadelphia.

What was Michael A. Harrison's occupation?

Michael A. Harrison was a computer scientist.

What was Michael A. Harrison known for?

Michael A. Harrison was known for Formal language theory and Harrison-Ruzzo-Ullman model.

What nationality was Michael A. Harrison?

Michael A. Harrison was American.

Sources & further reading

· Wikipedia: Michael A. Harrison

· Wikidata: Q16729674

· DBpedia: Michael A. Harrison

Cite this page

APA: Biography.guide. (2026). Michael A. Harrison. https://biography.guide/michael-a-harrison/

MLA: "Michael A. Harrison." Biography.guide, https://biography.guide/michael-a-harrison/.

Chicago: "Michael A. Harrison." Biography.guide. https://biography.guide/michael-a-harrison/.

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