National Security Agency cryptographers

Abraham Sinkov (August 22, 1907 – January 19, 1998) was a US cryptanalyst. An early employee of the U.S. Army's Signal Intelligence Service, he held several leadership positions during World War II, transitioning to the new National Security Agency after the war, where he became a deputy director. After retiring in 1962, he taught mathematics at Arizona State University.

Frank Waring Lewis (August 25, 1912 – November 18, 2010) was an American cryptographer and cryptic crossword compiler. His puzzles were printed in The Nation for over 60 years, for a total of 2,962 puzzles. Leonard Bernstein, Kurt Vonnegut, and Katha Pollitt were listed among the fans of his puzzles.