Harold Scott MacDonald "Donald" Coxeter was a British-Canadian geometer and mathematician. He is regarded as one of the greatest geometers of the 20th century.
Coxeter in 1970
The Senior Wrangler is the top mathematics undergraduate at the University of Cambridge in England, a position which has been described as "the greatest intellectual achievement attainable in Britain"
H. S. M. Coxeter
…the standard of mathematics was higher. Coxeter won an entrance scholarship and went to Trinity in 1926 to read mathematics. There he earned his BA (as Senior Wrangler) in 1928, and his doctorate in 1931. In 1932 he went to Princeton University for a year as a Rockefeller Fellow, where he worked with Hermann Weyl…
1842 in the Senate House, Cambridge: the Senior Wrangler, achiever of "academic supremacy" (here, Arthur Cayley), is admitted to his degree as the top scorer in the university's final-year examinations in mathematics.
Sir Frederick Pollock, 1st Baronet, Senior Wrangler, 1806.
John Herschel, Senior Wrangler, 1813.
George Biddell Airy, Senior Wrangler, 1823.