Powell plays an American cryptologist who tangles with German spies while falling in love. William Friedman, America's foremost cryptologist, was heavily influenced by Poe. Souradyuti Paul is an Indian cryptologist (b. 1976). He joined the NSA in 1958 as a cryptologist. Charles Weill Rackoff is an American cryptologist. According to Clarke, she knew of only one other female cryptologist working at Bletchley Park. John A. Walker Jr. is a cryptologist with the US Navy on a sub. A military cryptologist in World War I, he joined the Foreign Office in 1919. During World War II, Joos was a cryptologist for the US Signal Security Agency. Elonka Dunin (; born December 29, 1958) is an American video game developer and cryptologist.