Margaret Hamilton, Whose Code Helped Land Apollo 11, Dies

Margaret Hamilton, the software pioneer whose code helped guide Apollo 11 to the Moon, has died. Her work shaped the early years of spaceflight computing, and her ideas still influence how engineers build complex software.

Hamilton led the team at MIT's Instrumentation Laboratory that wrote the onboard flight software for NASA's Apollo missions. During the descent in July 1969, the lunar module's guidance computer began flashing alarms because it was overloaded with tasks. Her design relied on priorities, letting the machine drop less important work and keep the landing on course. That approach proved decisive when the Eagle touched down.

She also gave the discipline its name. Hamilton is credited with coining the term "software engineering" to argue that programming deserved the same rigor as other engineering fields. Later she founded two software companies, Higher Order Software and Hamilton Technologies, which built development tools and methods for large systems.

Her death marks the loss of one of the first people to treat software as a serious engineering challenge, long before it became central to nearly every industry.