Margaret Hamilton, Software Engineering Pioneer, Dies at 90

Margaret Hamilton, the MIT computer scientist who led the development of the onboard flight software for NASA’s Apollo missions, died on September 30, 2026 at age 90 in a Cambridge hospital, according to her daughter Lauren and MIT’s Department of Aeronautics and Astronautics. MIT announced her death in an obituary published October 7, 2026. Her work on the Apollo Guidance Computer kept the lunar-module computer functional during the critical “1202” alarm on July 20, 1969, allowing the Moon landing to proceed.

Margaret Hamilton dies at 90: How her NASA software helped take Apollo 11 to the Moon CBS KBZK 7 - BozemanMargaret Hamilton, who led the software team behind the Apollo moon landings, dies at 90 Margaret Hamilton dead at 90: The woman whose code landed humans on the moon

Hamilton was born on August 17, 1936 in Paoli, Indiana. She earned a BA in mathematics with a minor in philosophy from Earlham College in 1958. After moving to Boston in 1959, she programmed weather-prediction software for Edward N. Lorenz in MIT’s meteorology department and later wrote code for the SAGE air-defence system at MIT Lincoln Laboratory, where she first encountered software reliability.

Margaret Hamilton, computing pioneer who led software development for the Apollo program, dies at 90

In 1965 Hamilton answered an MIT ad seeking programmers to “send man to the moon.” Hired as the first programmer—and the first woman—on the Apollo project, she eventually led the team that wrote the flight software for the crewed Command and Service Modules. By 1968 she was assistant director overseeing a group of more than 400 people working on Apollo software. The priority-driven architecture she championed could drop low-priority tasks when the computer became overloaded, a capability that saved the Apollo 11 landing when the “1202” alarm sounded.

Margaret Hamilton dies at 90: How her NASA software helped take Apollo 11 to the Moon Margaret Hamilton, Apollo Software Pioneer, Dies at 90 The Register UKMargaret Hamilton, computing pioneer who led software development for the Apollo program, dies at 90

• 130+ technical publications authored.

Margaret Hamilton, computing pioneer who led software development for the Apollo program, dies at 90

• 400+ engineers and programmers contributed to Apollo software overall.

Margaret Hamilton dies at 90: How her NASA software helped take Apollo 11 to the Moon

• The Apollo Guidance Computer weighed roughly 70 lb per unit.

New York Times

Hamilton’s insistence on rigorous testing and defensive programming helped define “software engineering” as a discipline. Her techniques for anticipating operator error and hardware faults are now standard in aerospace, medical devices, financial trading platforms, and everyday operating systems. The code her team wrote was released on GitHub in 2015, underscoring its lasting educational value.

Margaret Hamilton, Pioneer of Software Engineering, Dies at 90

• Olivier de Weck, MIT’s Apollo Program Professor, said: “To say Margaret Hamilton was a pioneer — to say she was ahead of her time — would be a dramatic understatement.”

Margaret Hamilton dies at 90: How her NASA software helped take Apollo 11 to the Moon

• Jerry M. Wohletz, CEO of Draper Laboratory, said Hamilton “left an indelible mark” on the organization and its legacy.

GB News

• “To say Margaret Hamilton was a pioneer — to say she was ahead of her time — would be a dramatic understatement. She was a software engineer at a time when that field was in its infancy, and she not only developed advanced code herself but also led a team in using that nascent technology to develop one of the most complex systems humanity had ever achieved,” — Olivier de Weck.

Margaret Hamilton, computing pioneer who led software development for the Apollo program, dies at 90