Richard Guy
Keywords: People
Richard K. Guy is, with Elwyn Berlekamp and John Conway one of the authors of Winning Ways (for your Mathematical Plays), a seminal book on Combinatorial Game Theory and its applications to a plethora of specific games which, however, says little about go.
He also collaborated with Conway on The Book of Numbers, a survey of many number systems (including surreal numbers) and their properties.
He is an Emeritus Professor of Mathematics at the University of Calgary and a mountaineer. See also his Wikipedia profile.