William Frederick Friedman
Cryptographer
William Frederick Friedman was a US Army cryptographer who ran the research division of the Army's Signal Intelligence Service in the 1930s, and parts of its follow-on services into the 1950s. Wikipedia
Born: September 24, 1891, Chișinău, Moldova
Died: November 12, 1969 (age 78 years), Washington, D.C.
Spouse: Elizebeth Smith Friedman (m. 1917–1969)
Children: 2
Significant advance: cryptologist