Peter Johnstone (mathematician)

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Peter Tennant Johnstone (born 1948) is Professor of the Foundations of Mathematics at the University of Cambridge, and a fellow of St. John's College.[1] He invented or developed some ideas in topos theory. His thesis, completed at the University of Cambridge in 1974, was entitled "Some Aspects of Internal Category Theory in an Elementary Topos".[2]

He is a great-great nephew of the Reverend George Gilfillan who was apostrophised in William McGonagall's first poem.[3]


  • Johnstone, Peter (1977), Topos Theory, Academic Press, ISBN 978-0-12-387850-2, Zbl 0368.18001.
— "[F]ar too hard to read, and not for the faint-hearted"[4]


  1. ^ "Fellows of St. John's College 2009". Cambridge University Reporter. 2009-10-02.
  2. ^ "The Mathematics Genealogy Project - Peter Johnstone".
  3. ^ Hunt, Chris, William McGonagall: Collected Poems, Birlinn, 2006, px
  4. ^ An anonymous referee, as quoted by Johnstone in his Sketches of an elephant, p. ix.

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