Margaret Hamilton, the pioneering computer scientist whose code guided NASA’s Apollo missions and helped land humans on the Moon for the first time, has died at the age of 90.
Her former employer, the Massachusetts Institute of Technology (MIT), confirmed that she passed away on September 30, 2026 . Hamilton’s work was instrumental in the success of the 1969 Apollo 11 lunar landing, and her legacy includes popularizing the term “software engineering” at a time when the field was in its infancy.
Born in Paoli, Indiana, in 1936, Hamilton studied mathematics before moving to Boston, where she joined MIT in 1959 . She initially worked on weather prediction software, but in 1965 she saw an advertisement seeking programmers to develop software to “send man to the moon.” She applied and was hired as the first programmer for the Apollo project at MIT—and the first woman in that role . By 1968, she had been promoted to assistant director of the Command and Service Module team, overseeing more than 400 people working on Apollo’s software.
Hamilton’s most critical contribution came during the Apollo 11 landing on July 20, 1969. Just minutes before the lunar module was set to touch down, the onboard computer triggered a 1202 alarm, indicating an overload . However, Hamilton and her team had designed “priority-driven software” that could shed less important tasks and focus on the most mission-critical operations—specifically, the landing itself . This foresight allowed the landing to continue safely, enabling Neil Armstrong and Buzz Aldrin to become the first humans to walk on the Moon.
Tributes poured in from across the scientific community. MIT described her as a “profoundly influential computer scientist,” and Olivier de Weck, the Apollo Program Professor at MIT, stated: “To say Margaret Hamilton was a pioneer—to say she was ahead of her time—would be a dramatic understatement” . NASA Administrator Jared Isaacman also honored her on X, calling her “a pioneer whose work helped make Apollo and humanity’s first journeys to the moon possible” . In 2016, President Barack Obama awarded Hamilton the Presidential Medal of Freedom, the nation’s highest civilian honor, for her contributions to science and space exploration .