Introduction
Hedy Lamarr was once a household name, but she fell into obscurity during her own lifetime. In the mid-twentieth century, Hedy was most well known as a famous actress, hailed as "the most beautiful woman in the world," by her employers (MGM Studios), the press and the public. Concurrently, she was a genius inventor. She came up with, and initially patented, the idea of frequency hopping for wireless communication; an aspect of her identity which was little appreciated by those that surrounded her, and unknown by the public until close to her death. Nowadays, it is about a fifty-fifty chance on whether people remember her as an actress or an inventor, if they remember her at all. Today I seek to help her regain some of the recognition she so justly deserves. I will do that by laying out who Hedy was, what frequency hopping is, and why it is still so important to this day.
![]() |
Hedy Lamarr in Let's Live A Little (1948) - Wikimedia Commons |
A Condensed Life Story
Hedy was not born Hedy at all, but instead came into the world as Hedwig Eva Maria Kiesler on November 9th, 1914, in Vienna, Austria. Her father was a bank manager and her mother was a concert pianist (1). Hedwig grew up in a well-off household exposed to the arts and the sciences, but as a young teenager in Vienna she set her sights on being an actress. One day, she skipped school and snuck onto a movie set, quickly cementing herself as a script girl until she was offered some small film roles. She eventually convinced her parents to let her quit school and go to Berlin to study acting (2). Hedy continued to do some small movie parts, as well as acting, and even starring, in theatre plays, until she got her big break, the leading role in Gustav Machatý’s Ekstase (Ecstasy), a Czech art house film, at age 17. This film would follow Hedy for the rest of her career due to its explicit content, which also led to American and German review boards censoring it (3).
While starring in a play in Berlin, Hedy met the arms dealer Fritz Mandl, who she later married. Mandl was a very controlling man, who did not let Hedy continue her acting career, or pursue her invention ideas; he treated her as a beautiful show piece. Hedy felt trapped, and ended up fleeing from Mandl in the dead of the night, escaping to England on the cusp of the Second World War (4). While in London, she met the head of MGM Studios, Louis B. Mayer, who offered her a contract to become a Hollywood actress. After rejecting his first offer, Hedy got herself on Louis' ship back to New York, where she secured a better contract on the condition of changing her name, and thus Hedy Lamarr was born (5). Her acting career was tumultuous, as while she was billed as "the most beautiful person in the world," and enjoyed widespread fame, her movies were either huge hits or complete flops, and no one seemed convinced she could even act. Hedy eventually grew bored with acting and the life of a star, so would seek refuge in her inventions (6).
![]() |
Hedy Lamarr and Victor Mature in Samson and Delilah (1949) - Movie Trailer Still |
A Natural Inventor
When she was a child, Hedy's father would take her on walks around Vienna, during which he would teach her about science and the way things worked. This was her first introduction to science and inventions. These walks spurred her interest in inventing, and in trying to find ways to make the world better (7). While this was an interest that suffered under Mandl, as everything in Hedy's life did, it is one that she could nurture in America, and there it began to flourish. She set up an inventing wing in her home, and kept many scientific books (8). She even worked on her ideas on movie sets between takes, using a small, mobile inventing set given to her by her friend, Howard Hughes.
Hedy helped Howard invent a faster airplane, by researching fish and bird species, then combining the elements of the fastest bird and fastest fish into an airplane wing design (9). During the war, she made an attempt at inventing soda tablets to deal with rationing, though they were ultimately unsuccessful. Arguably Hedy's most important and impactful invention was her idea for frequency hopping, which she developed and patented alongside her friend George Antheil in 1941 (10). Hedy realized there was a need for a more secure means of wireless communication to help with the war effort, and so she set out to fix the problem, as she didn't "have to work on ideas, they come naturally," (11).
-_-_- Frequency Hopping _-_-_
So what is frequency hopping? How does it work? And why is it so important?
In short, frequency hopping is a way of encoding radio signals so that they cannot be overheard, intercepted, or jammed. The simplest explanation for how it works is that the transmitter and the receiver are each set to a matching code, so that they are able to synchronize the message being sent. That message then bounces between many different frequencies very quickly, instead of being sent solely across one frequency. This way, if one of the frequencies broadcasting the message is intercepted, the person(s) who intercepted it can only hear a short amount of it- often only one second. It also means if one of the frequencies is jammed, only a small part of the message is blocked from the receiver, the whole thing is not lost.
Hedy and George proposed to do this by using a system George had developed for a piano piece he composed, Ballet Mécanique, which used multiple synchronized player pianos that would pick up from one another to continue the score, bouncing the music around and letting it become almost mechanized. The two friends adapted his punch card powered pianos to a system that would work for radio signals. Their proposed system used 88 (the number of keys on a piano) frequencies to transmit information encoded into audio tones at different frequencies, that were then sent between apparently random selected carrier frequencies. To ensure transmission of each frequency was synchronized, a synchronization pulse was sent between the transmitter and the receiver at the beginning of the message, and each end of the circuit proceeded to use tape measures set to accurately controlled speeds. In 1941, they patented their "Secret Communication System" and were granted U.S patent 2,292,387 (12). They tried to deliver their idea to the U.S military, however, the military instead seized the patent because Hedy, as an Austrian, was still considered an "enemy alien," despite how long she had lived in the United States, and that she wanted to help her adopted country. This ensured that she would never recieve any money or recognition from her invention, and while it was not implemented in the Second World War due to a lack of appropriate technology, it was used by the U.S military in the following decades. Of course, her "enemy alien" status did not seem to apply when the military instructed her to use her fame and beauty to sell war bonds instead of inventing (13).
Frequency hopping, also known as spread spectrum technology, has additionally had widespread use outside of military application. It is the basis, and what powers, so much of what we rely on today in our modern world, like GPS, Bluetooth, and secure wi-fi. While its application is different from what Hedy envisioned, the principles behind it remain remarkably similar to those she first devised in 1941 (14). Without her, it is hard to say when we would have figured out the technology needed for the Internet, and the rapid innovation it brought, and yet, because she had beauty and fame on top of intelligence, she gets no credit for her revolutionary idea.
![]() |
Patent Case File No. 2,292387, Page 6, National Archives at Kansas City |
Conclusion
Hedy Lamarr died on January 19th, 2000, at age 85, while living in relative obscurity in Florida. Despite the vast fame she experienced for decades of her life, her acting career, and thus her name recognition, petered out not long after the Second World War. It was only for the last decade of her life, starting in 1990, that she began regaining some of that notoriety, but now in small segments of the scientific community. In 1997, the Electronic Frontier Foundation jointly awarded her and Anthiel their Pioneer Award for their invention of frequency hopping (15). When I started preparing this blog post, I asked as many people in my life as I could if they remembered Hedy Lamarr, and almost no one did. My hope is that this account of her life and inventions helps to spread her name and legacy throughout the public once more.
Bibliography
1. Colleen Cheslak, “Hedy Lamarr,” National Women’s History Museum, August 30, 2018, https://www.womenshistory.org/education-resources/biographies/hedy-lamarr.
2. Lena Thomas,”Actress Hedy Lamarr, Inventor: A Public Image Reframed,” (master’s thesis, University of Saskatchewan, 2022), 47.
3. Bombshell: the Hedy Lamarr Story, directed by Alexandra Dean (2017; Reframed Pictures), Youtube.
4. Thomas, “Actress,” 3.
5. Bombshell.
6. Thomas, “Actress,” 56-57.
7. Cheslak, “Hedy Lamarr.”
8. Thomas, “Actress,” 4.
9. Bombshell.
10. Thomas, “Actress,” 57.
11. Hedy Lamarr, quoted in Bombshell.
12. Karl-Arne Markström, “The Invention by Hedy Lamarr and George Antheil of Frequency-Hopping Spread-Spectrum Secret Communications,” The Radio Science Bulletin, no. 372 (2020): 62-63.
13. Thomas, “Actress,” 6, 81.
14. Markström, “The Invention,” 62-63.
15.Cheslak, “Hedy Lamarr.”