Harold Keen

Harold Hall "Doc" Keen (1894–1973) was a British engineer who oversaw the construction of the British bombe, a codebreaking machine used in World War II to read German messages sent using the Enigma machine. He was known as "Doc" Keen because of his habit of carrying tools and paperwork in a case resembling a doctor's bag.

Career before World War II

Keen was born in the Shoreditch borough of north London in 1894. By age 18 he had moved to Kentish Town and began studying Electrical Engineering. In 1912 he joined the British Tabulating Machine Company, established to import and assemble American punched card technology. In 1916, Keen joined the Royal Flying Corps and was assigned to the ground staff of a bomber squadron in northern France. In 1919 he returned to BTM and married an Eva Burningham. In 1921, Keen moved with BTM to Letchworth in Hertfordshire. Two years later, he was appointed head of the Experimental Department, and his innovations there gained him the reputation as the leading British innovator of punched-card technology; Keen was granted more than sixty patents. In the 1930s he became Chief Engineer.

References

* John Keen, "Harold 'Doc' Keen and the Bletchley Park bombe", 2003.

See also

* Joseph Desch