Annie Jean Easley (April 23, 1933 – June 25, 2011) was an African American computer scientist who contributed significantly to the beginning iterations of NASA's rocket technologies.
Easley was born in 1933 in Birmingham, Alabama, and was raised by a single mother. Segregation disallowed Annie from many normal job opportunities that others of different color and gender might get, but her mother strived for her to have a good education nonetheless. She attended Holy Family High School for most of her schooling life, culminating in her graduating as valedictorian.
From there, Easley enrolled at Xavier University in New Orleans to study pharmacy. Her interest in the subject waned from her initial excitement, and she returned to Birmingham briefly in 1945 to vote but was subjected to the poll tax. Her college experiences helped her to encourage other women to overcome some of the voting restrictions.
Eventually, Easley would get married and move to Cleveland, Ohio but could not secure a pharmacy job after finding out the area did not have many available. She read an article in the paper about a mathematician opportunity in NASA. Following that reading, her career started as a NASA engineer and spanned decades, inspiring many women of color and outreach programs to support women in STEM fields.
Her innovation in programming technologies, energy-conversion, and shuttle launches made her a significant part of NASA’s history and addressed a major pain point they had at the time: lack of interdisciplinary mathematicians and programmers. The work she did spanned all aspects of her life, from her previous degrees to her newly learned languages and work of battery cells all contributed greatly to NASA’s project Centaur launches and paved the way forward for future iterations of space shuttles. Additionally, her work in outreach programs for young innovators and mathematicians was instrumental in breaking down gender barriers for STEM.
Annie Easley was born to Bud and Willie (née Sims) McCrory in Birmingham, Alabama. She had a brother six years her senior. Her mother raised them as a single mother.
Before the Civil Rights Movement, educational and career opportunities for African-American children were very limited. Segregation was prevalent, African-American children were educated separately from white children, and their schools were often inferior to white schools. Annie's mother told her that she could be anything, but she would have to work at it. She encouraged Annie to get a good education. From the fifth grade through high school, Annie attended Holy Family High School, and was valedictorian of her graduating class. At a young age Annie had interest in becoming a nurse, but around the age of 16 she decided to study pharmacy.
In 1950, Easley enrolled in classes at Xavier University of Louisiana in New Orleans, an African-American Catholic university, and majored in pharmacy for about two years. She left Xavier to get married and moved to Cleveland, Ohio.
In 1977, she obtained a Bachelor of Science in Mathematics from Cleveland State University.
Her career began as a human computer in 1955, doing computations for researchers by hand. Her first work was on running simulations for the newly instated Plum Brook Reactor facility. At the time of hiring, she was only one of four African American employees in the lab. Despite these troubles, she always maintained a positive attitude and tried to go out and do her best work as she famously said in a 2001 interview.
Easley began as a human computer, performing manual calculations for researchers before transitioning to computer programming as digital systems were introduced at NASA. As computers evolved and programming languages were developed, Easley mastered them quickly. Her skill in Formula Translating System (Fortran) and the Simple Object Access Protocol (SOAP) made her critical in supporting a lot of NASA’s early programs. Her code was integrated into analyzing energy-conversion and power-technology systems for early-model hybrid vehicles and rockets.
One of her notable technical contributions was her work on energy conversion systems, including simulations that supported the development of battery technology for early hybrid vehicles. She was also involved in programs related to alternative energy sources, including solar and wind technologies.
These skills would serve her well in the development of Centaur, a high-energy booster rocket which was dedicated to being one of the most powerful rockets in the U.S. space program. The unique fuel mix of liquid hydrogen and oxygen were in part inspired by Easley. Easley played a significant role in the Centaur rocket program, which was critical to the success of multiple satellite launches and planetary missions. Her programming work supported analyses and mission planning for the Centaur upper-stage rocket, known for being the first to use liquid hydrogen and liquid oxygen as propellants. This technology was integral to launching spacecraft for missions such as Cassini and Voyager, and remains a foundational component of modern rocket design.
In the 1970s, Easley pivoted slightly to finish a degree in Mathematics at Cleveland State while working full-time. She encouraged many other women of color at the university to be passionate and follow their dreams despite how hard they may be.
Throughout her 34-year career at NASA, Easley faced systemic obstacles that were common for women and minorities in STEM fields. Despite holding a mathematics degree and taking internal specialization courses, she was not always afforded the same professional development opportunities as her peers. For instance, she was denied educational financial aid without explanation and was hired at a lower pay grade than promised. In her interview, she was told she would start as a GS-3, but her first paycheck listed her as a GS-2. When she questioned it, she was told no GS-3 positions were available.
In addition to her technical work, Easley served as an Equal Employment Opportunity (EEO) counselor at NASA, helping to mediate and resolve workplace discrimination cases. She advocated for inclusive hiring practices and was involved in recruitment outreach to colleges, encouraging more women and minorities to enter engineering and science careers. Easley retired from NASA in 1989, leaving behind a legacy of resilience, innovation, and quiet leadership that helped expand the boundaries of who could contribute to scientific advancement at the nation’s space agency.
Her 34-year career included developing and implementing computer code that analyzed alternative power technologies, supported the Centaur high-energy upper rocket stage, determined solar, wind and energy projects, and identified energy conversion systems and alternative systems to solve energy problems. During the 1970s Easley worked on a project examining damage to the ozone layer. With massive cuts in the NASA space program, Easley began working on energy problems; her energy assignments included studies to determine the life use of storage batteries, such as those used in electric utility vehicles. Her computer applications have been used to identify energy conversion systems that offer the improvement over commercially available technologies. Following the energy crisis of the late 1970s, Easley studied the economic advantages of co-generating power plants that obtained byproducts from coal and steam. After retiring in 1989, she remained an active participant in the Speaker's Bureau and the Business & Professional Women's Foundation. Despite her long career and numerous contributions to research, she was cut out of NASA's promotional photos. In response to one such event, Easley responded by saying "I'm out here to do a job and I knew I had the ability to do it, and that's where my focus was, on getting the job done. I was not intentionally trying to be a pioneer."
Easley's work with the Centaur project helped lay the technological foundations for future space shuttle launches and launches of communication, military and weather satellites. Her work contributed to the 1997 flight to Saturn of the Cassini probe, the launcher of which had the Centaur as its upper stage.