Tommy Flowers (1905 - 1998)
Thomas Harold Flowers, or Tommy Ford, was a British engineer. He helped design the first programmable electronic computer, named Colossus, during WWII. Colossus was used to help decode messages from the Germans. Flowers began his job as an engineer in the GPO (Government Publishing Office) in 1926, and in 1930 he joined their research center in London. Much of the information that Flowers knew because of having worked creating Colossus and helping with the war was classified. Even in 2011 (and possibly now, in 2015) some of the information regarding him is classified.