Margaret Hamilton, Apollo Software Pioneer Who Coined ‘Software Engineering,’ Dies at 90

Margaret Hamilton, the computer scientist whose groundbreaking work enabled NASA’s Apollo 11 Moon landing, has died at the age of 90. A trailblazer in her field, Hamilton led the team that developed the onboard flight software for the Apollo missions and is credited with coining the term “software engineering.”

The Massachusetts Institute of Technology (MIT), her former employer, confirmed her passing on September 30. “To say Hamilton was a pioneer—to say she was ahead of her time—would be a dramatic understatement,” the institute stated, noting she practiced software engineering long before the discipline was mainstream.

Hamilton worked at MIT from 1959 through the mid-1970s, where she managed the Software Engineering Division. Under her leadership, engineers wrote and tested all in-flight software for the Apollo 11 mission that guided astronauts Neil Armstrong and Buzz Aldrin to the lunar surface. “I was attracted both by the sheer idea and the fact that it had never been done before. I was the first programmer to join and the first woman they hired,” she recalled in a 2019 interview with the Guardian.

Her team’s foresight proved critical moments before the historic 1969 landing. When an onboard computer triggered an alarm signaling an overload, the priority-driven software architecture Hamilton championed automatically shed lower-priority tasks to preserve the landing sequence. The mission proceeded successfully.

The scale of that achievement was famously captured in a 1969 photograph showing Hamilton standing beside a towering stack of printed Apollo guidance code—a lasting symbol of the foundational role software played in humanity’s first steps on the Moon.

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