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John Conway is a Fellow of Gonville and Caius College and a former Fellow of Sidney Sussex College, Cambridge, and is Reader in Pure Mathematics at the University of Cambridge. He has held visiting professorships at several universities and has made original contributions to many branches of mathematics, notably transfinite arithmetic, the theory of knots, many-dimensional geometry and the theory of symmetry (group theory).
Richard Guy has taught mathematics at many levels and in many places-England, Singapore, India, Canada. Since 1965 he has been Professor of Mathematics at the University of Calgary and he is a member of the Board of Governors of the Mathematical Association of America.He edits the Unsolved Problems section of American Mathematical Monthly; he wrote the volume on Number Theory for the series:Unsolved Problems in Intuitive Mathematics and is preparing another on Combinators, Graph Theory, and Game Theory. He is a keen member of the Alpine Club of Canada.