H. S. M. Coxeter

H. S. M. Coxeter
CC FRS FRSC
H. S. M. Coxeter CC FRS FRSC
	Coxeter in 1970
Born	Harold Scott MacDonald Coxeter; 9 February 1907; London, England
Died	31 March 2003 (aged 96); Toronto, Ontario, Canada
Education	University of Cambridge (BA, PhD)
Known for	Boerdijk–Coxeter helix; Coxeter element; Coxeter functor; Coxeter graph; Coxeter group; Coxeter matroid; Coxeter notation; Coxeter's loxodromic sequence of tangent circles; Coxeter–Dynkin diagram; Coxeter–Todd lattice; Goldberg–Coxeter construction; LCF notation; Petrie–Coxeter polyhedra; Todd–Coxeter algorithm; Tutte–Coxeter graph;
Spouse	Hendrina (died 1999)
Children	2
Awards	Smith's Prize (1931); Henry Marshall Tory Medal (1949); FRS (1950); Jeffery–Williams Prize (1973); CRM-Fields-PIMS prize (1995); Sylvester Medal (1997);
	Scientific career
Fields	Geometry
Workplaces	University of Toronto
Doctoral advisor	H. F. Baker
Doctoral students	W. G. Brown; Norman Johnson;

Harold Scott MacDonald "Donald" Coxeter (/ˈkɒksitər/) (9 February 1907 – 31 March 2003) was a British-Canadian geometer and mathematician. He is regarded as one of the greatest geometers of the 20th century.

Coxeter was born in England and educated at the University of Cambridge, with student visits to Princeton University. He worked for 60 years at the University of Toronto in Canada, from 1936 until his retirement in 1996, becoming a full professor there in 1948. His many honours included membership in the Royal Society of Canada, the Royal Society, and the Order of Canada.

He was an author of 12 books, including The Fifty-Nine Icosahedra (1938) and Regular Polytopes (1947). Many concepts in geometry and group theory are named after him, including the Coxeter graph, Coxeter groups, Coxeter's loxodromic sequence of tangent circles, Coxeter–Dynkin diagrams, and the Todd–Coxeter algorithm.