Donald Preece is an Emeritus Professor in the University of London, and an Emeritus Professor of the University of Kent.
His professional specialisations have been statistics and combinatorics.

His lecture today is a revised version of a lecture specially written for celebrations of his 70th birthday last year.

A copy of the lecture will be going up on the web, and it will contain a bibliography listing all the works of literature that he will be referring to.