Lord Byron's daughter wrote the world's first computer program in 1843 — for a machine that wouldn't be built for another 100 years — and predicted computers could one day compose music.
Ada Lovelace was born in 1815 as the only legitimate child of the scandalous poet Lord Byron. Her mother, terrified that Ada would inherit her father's volatile temperament, deliberately steered her education entirely toward mathematics and science — fields considered deeply unfeminine at the time. It was a plan that accidentally helped create the world's first computer programmer.
In 1833, at age 17, Ada met the mathematician Charles Babbage at a dinner party and became captivated by his designs for a mechanical calculating machine called the Analytical Engine. She began a collaboration that would define her legacy, even though Babbage's machine was never actually completed during their lifetimes.
In 1843, Ada was asked to translate an Italian article about the Analytical Engine. She did so — and then added her own notes that were three times longer than the original article. These notes, particularly 'Note G,' contained what is now recognized as the world's first published algorithm: a step-by-step method for the machine to calculate Bernoulli numbers.
What made Ada's vision extraordinary was not just the algorithm itself, but her insight about what such machines could ultimately do. While Babbage saw his engine as a calculator, Ada wrote that it could be used to compose music and process any information that could be expressed in symbols — a century before Alan Turing and the modern computer.
Ada's life was marked by chronic illness, probably stemming from a measles infection in childhood that left her bedridden for years. She was also a compulsive gambler who accumulated significant debts, and she died at just 36 of cervical cancer — the same age her father Byron had died. She was buried next to him, the father she had never really known.
For over a century, Ada's contributions were largely forgotten. It was only in the 1950s and 1960s, when computer scientist Alan Turing began citing her work, that her significance was rediscovered. In 1980, the U.S. Department of Defense named a newly developed programming language 'Ada' in her honor — one of the rare instances of a programming language named after a person.
Ada Day is now celebrated annually on the second Tuesday of October as a global celebration of women in science, technology, engineering, and mathematics. Her portrait hangs in a place of honor at the Computer History Museum, and she is widely considered the patron saint of the modern computing world.