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Margaret Hamilton, Architect of Apollo Software, Dies at 90

Her self‑monitoring, priority‑based code let the lunar module continue during a 1969 computer overload and changed how engineers treat software.

Overview

  • MIT confirmed late Thursday that Margaret Hamilton died on September 30, 2026, and the institute publicly announced her passing on October 8, 2026; no cause of death has been disclosed.
  • Hamilton led the MIT team that developed the Apollo onboard software beginning in 1968, guiding a group of developers to build the mission’s flight code.
  • Her program could watch its own processes and prioritize critical tasks, behavior that allowed the Apollo 11 computer to reject nonessential work when a 1202 overload error occurred and still complete the landing.
  • She helped define and promote the term software engineering, published more than 130 technical papers, founded software firms after leaving MIT, and received the Presidential Medal of Freedom in 2016.
  • NASA leaders and MIT colleagues have praised her as a pioneer whose work shifted public and engineering views of software and who helped make reliable, safety‑critical code a central part of modern engineering practice.