**Michael Barr** (born January 22, 1937) is Peter Redpath Emeritus Professor of Pure Mathematics at McGill University.^{[1]}

## Early life

He was born in Philadelphia, Pennsylvania, and graduated from the 202nd class of Central High School in June 1954. He graduated from the University of Pennsylvania in February 1959, and received a PhD from the same school in June 1962. He taught at Columbia University and the University of Illinois before coming to McGill in 1968.

## Career

His earlier work was in homological algebra, but his principal research area for a number of years has been category theory. He is well known to theoretical computer scientists for his book *Category Theory for Computing Science* with Charles Wells, as well as for the development of *-autonomous categories and Chu spaces which have found various applications in computer science. His monograph **-autonomous categories*, and his books *Toposes, Triples, and Theories*,^{[2]}^{[3]} also coauthored with Wells, and *Acyclic Models*, are aimed at more specialized audiences.

He is on the editorial boards of *Mathematical Structures in Computer Science* and the electronic journal *Homology, Homotopy and Applications*, and is editor of the electronic journal *Theory and Applications of Categories*.

## References

**^**"Mathematics and Statistics". McGill University. Retrieved 11 August 2011.**^**Pitts, Andrew (March 1991), "Review of Toposes, Triples and Theories by Barr, M., & Wells, C.",*Journal of Symbolic Logic*,**56**(1): 340–341, doi:10.2307/2274934**^**Rota, Gian-Carlo (August 1986), "Toposes, triples and theories: M. Barr and C. Wells, Springer, 1985, 345 pp.",*Advances in Mathematics*,**61**(2): 184, doi:10.1016/0001-8708(86)90076-9

## External links

*Toposes, Triples and Theories*, updated edition of text published in 1983.*Category Theory for Computing Science*updated edition of text published in 1999.- http://www.tac.mta.ca/tac (Theory and Applications of Categories)
- https://web.archive.org/web/20080704125156/http://www.math.rutgers.edu/hha/geninfo.html (Homology, Homotopy and Applications)
- Michael Barr at the Mathematics Genealogy Project