His The decline and fall of Zarankiewicz's theorem, 1968.

Berlekamp, E. R. Winning ways, for your mathematical plays, 1982- : v. 1, t.p. (Richard K. Guy) p. ix (b. 9/30/16)

Wikipedia page, viewed 17 March 2020: (Richard Kenneth Guy (30 September 1916 - 9 March 2020) was a British mathematician. He...) https://en.wikipedia.org/wiki/Richard_K._Guy

The mathematics of various entertaining subjects. Volume 2, 2017: page 383 (Richard K. Guy has taught mathematics from kindergarten to post-doctoral level)

Wikipedia web site, March 8, 2022: (Richard K. Guy, Richard Kenneth Guy (30 September 1916 - 9 March 2020) was a British mathematician. He was a professor in the Department of Mathematics at the University of Calgary. Guy was born 30 September 1916 in Nuneaton, Warwickshire, England ; Alma mater: Gonville and Caius College, Cambridge, (B.A. in 1938, M.A. in 1941) ; died, 9 March 2020 (aged 103), Calgary, Alberta, Canada)