Ada Lovelace was an English mathematician — and daughter of the poet Lord Byron — who worked with inventor Charles Babbage on an early mechanical computer called the Analytical Engine. Her notes on the machine included an algorithm for calculating Bernoulli numbers, work many consider the world's first computer program. She's remembered today as the first computer programmer, over a century before modern computers existed, and the U.S. Department of Defense later named its Ada programming language after her.