Lamarr was born Hedwig Eva Maria Kiesler in Vienna in 1914, the daughter of a successful bank director.
She began her acting career in Europe, both on stage and on film, and married a much older military arms merchant and munitions manufacturer. He was an extremely controlling husband and Lamarr left him and ran away to Paris in 1937 where she met Louis B Mayer.
It was Mayer who persuaded her to change her name to Hedy Lamarr (after the silent film actress Barbara La Marr) and began a Hollywood career in which she starred in more than twenty films.
But away from the screen, Lamarr was what you might describe as a tinkerer and came up with various inventions including an improved traffic light and a tablet that turned water into a carbonated drink.
She dated the tycoon Howard Hughes who actively encouraged her inventiveness and put a team of engineers at her disposal who would make anything she asked for.
It was during World War Two that Lamarr devised her most significant scientific contribution. She learned that the signal for radio-controlled torpedoes could be jammed, causing them to go off course, and came up with the idea of a frequency-hopping signal that could be neither tracked nor jammed.
She developed the idea with the help of her friend, the composer and pianist George Antheil, and they succeeded in creating a device that synchronised radio signals with a miniaturised player-piano mechanism.
The ‘Secret Communication System’ was granted a patent in 1942 but the technology was difficult to implement at that time and it wasn’t until the Cuban missile crisis in 1962 that an updated design of the device saw service on naval ships.
The spread-spectrum technology that Lamarr and Antheil devised contributed greatly to the development of GPS, wi-fi and Bluetooth and in 1997 they received the Electronic Frontier Foundation Pioneer Award.
Lamarr died in 2000 but in 2014 she was posthumously inducted into the National Inventors Hall of Fame and in 2017 a documentary film of her secret life was released and you can see the trailer below.