Harold Scott MacDonald Coxeter

Harold Scott MacDonald Coxeter CC FRS FRSC
Born	(1907-02-09)9 February 1907 London, England
Died	31 March 2003(2003-03-31) (aged 96) Toronto, Ontario, Canada
Alma mater	University of Cambridge (B.A., 1929; Ph.D., 1931)
Known for	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 Boerdijk–Coxeter helix Goldberg–Coxeter construction Todd–Coxeter algorithm* Tutte–Coxeter graph LCF notation Regular skew apeirohedra
Spouse(s)	Hendrina, died in 1999
Children	a daughter, Susan Thomas, and a son, Edgar
Awards	Smith's Prize (1931) Henry Marshall Tory Medal (1949) FPS (1950) Jeffery–Williams Prize (1973) CRM-Fields-PIMS prize (1995) Sylvester Medal (1997)
Scientific career
Fields	Geometry
Institutions	University of Toronto
Doctoral advisor	H. F. Baker[1]
Doctoral students	W. G. Brown Norman Johnson

Harold Scott MacDonald "Donald" Coxeter CC FRS FRSC (9 February 1907 – 31 March 2003)^[2] was a British-Canadian geometer and mathematician. He is regarded as one of the greatest geometers of the 20th century.^[3]

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.