Hedy Lamarr / Hedwig Eva Maria Kiesler (1914-2000): This Austrian-American’s inventions helped pave the way for modern security in wireless communications. Lamarr was also a famous Hollywood actress. We don’t know how she had the time! Though she used to be recognized mainly for her glamourous film career, in recent years she’s been popularly celebrated as an inventor, specifically for her work during World War II on frequency-hopping radio transmissions — controlled by tiny player-piano rolls! It aimed to help keep private radio messages secret.