Mathematician:Irving John Good

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British mathematician of Polish ancestry who worked as a cryptologist at Bletchley Park with Alan Turing.

Subsequently focused on the design of computers and Bayesian statistics.


English, of Polish origin


  • Born: 9 December 1916 in London, UK
  • Died: 5 April 2009 in Radford, Virginia, US

Theorems and Definitions


  • 1966: A Note on Richard's Paradox (Mind Vol. 75, no. 299: p. 431)

Also known as

Born Isadore Jacob Gudak to Polish Jewish parents.

Changed his name to Irving John Good and signed his publications I.J. Good.

Generally known as I.J. or Jack.