Boris Delaunay

Soviet mathematician (1890–1980).

Born March 15th, 1890 in Saint Petersburg. [ref]

Died July 17th, 1980 at 90 years old in Moscow.

Occupations
mathematician, mountaineer, university teacher
Wikipedia

Death is a challenge. It tells us not to waste time… It tells us to tell each other right now that we love each other. Leo Buscaglia