Before electronic computers became the backbone of modern science, complex aerospace calculations were performed by hand, laboriously, and with extreme precision. Among those who did this important work was mathematician Anne Easley, who began her career as a ‘human computer’ in the 1950s. Working at a time when both technology and opportunities were limited, he played a significant role in shaping early aerospace research. As machines gradually replaced manual calculations, Easley transformed himself into a skilled programmer and contributed to propulsion and energy projects that supported NASA’s growing ambitions.
NASA’s journey to become a ‘human computer’
Annie Easley was born on April 23, 1933, in Birmingham, Alabama, during a period when opportunities for black women were severely restricted. Despite these challenges, he developed a strong academic foundation and showed an early aptitude for mathematics. After moving to Cleveland, Ohio, he initially enrolled in a pharmacy program. When that program was discontinued they had to rethink their plans. A newspaper advertisement about a job opportunity for mathematicians inspired him to apply to the National Advisory Committee for Aeronautics. This decision marked the beginning of a long and influential career in aerospace research.Easley joined NACA in 1955 as a ‘human computer’, performing complex mathematical calculations manually. Teams like his worked on aerodynamics, flight trajectories, and propulsion systems, producing data that engineers relied on to test and improve aircraft and early space-related technologies.
Annie Easley works at the UNIVAC 1100/40 computer at NASA’s Lewis Research Center, used for data processing (25 February 1976).
transition to the computer age
A major change occurred in the late 1950s and 1960s as electronic computers began to replace manual calculations. Easley recognized the importance of embracing this change. She learned programming languages such as Fortran and became proficient in early computing systems. When NACA transformed into NASA in 1958, it was already moving into this new phase of work. His transition from manual calculations to programming allowed him to remain an active contributor during a period of rapid technological change.Easley spent most of his career at NASA Glenn Research Center, where he developed and tested computer programs to model real-world physical systems. His work supported research in propulsion, energy systems, and aerospace performance, reflecting the increasing reliance on computational methods in engineering.
Contribution to Centaur rocket program
One of Easley’s most notable contributions involved the Centaur upper-stage rocket program. The system used liquid hydrogen and liquid oxygen, making it one of the most efficient propulsion technologies of its time. Easley worked on programs that analyzed propulsion performance and energy efficiency, supporting calculations used in planning satellite launches and deep space missions.He also contributed to research on energy conversion and efficiency, including work related to battery systems and long-term power use. These efforts supported the broader goals of improving reliability and performance in aerospace systems.
Annie Easley received a Special Achievement Award from Henry Barnett and Gene Manganiello during a ceremony on June 30, 1970.
Overcoming barriers and advocating for inclusion
Easley’s career unfolded at a time of widespread racial and gender discrimination. As a Black woman in tech, she faced systemic challenges, yet she built a respected career and contributed important research. He supported equal employment initiatives and encouraged the younger generation to pursue careers in science and engineering.Easley worked for 34 years before retiring in 1989. During his career, he witnessed the transition from manual calculations to advanced computing and contributed to projects that advanced both aeronautics and space exploration.Today, Annie Easley is recognized as an important figure in the history of computing and aerospace. Her story highlights the importance of adaptability and draws attention to the contributions of women and underrepresented groups in STEM.