H. S. M. Coxeter
Harold Scott MacDonald "Donald" Coxeter, CC, FRS, FRSC was a British and later also Canadian geometer. He is regarded as one of the greatest geometers of the 20th century. *--Wikipedia*
Works (13)

Non-Euclidean geometry
1961

Introduction to geometry

Mathematical recreations and problems of past and present times
1892

Geometry revisited

Regular polytopes

Projective Geometry

The real projective plane

Generators and relations for discrete groups

The fifty-nine icosahedra

The Coxeter legacy

The Geometric Vein

The World of M.C. Escher

Twisted honeycombs