Gladys West

Gladys Brown West (née Gladys Mae Brown; October 27, 1930 – January 17, 2026) was an American mathematician. She was known for her contributions to mathematical modeling of the shape of the Earth, and her work on the development of satellite geodesy models, which were later incorporated into the Global Positioning System (GPS).

Early life and education Gladys Mae Brown was born in Sutherland, Virginia, in Dinwiddie County, a rural county south of Richmond, on October 27, 1930. Her family was an African American farming family in a community of sharecroppers. She was the second of four children.

At West's high school, the top two students from each graduating class received full scholarships to Virginia State College (Virginia State University, VSU), a historically black public university. Concurrently, West earned a master's degree in public administration from the University of Oklahoma. The project required five billion calculations conducted on a mainframe computer that used punched cards. West's work cut her team's processing time in half, and she was recommended for a commendation in 1979.

From the mid-1970s through the 1980s, West programmed an IBM 7030 Stretch computer to deliver increasingly precise calculations for the shape of the Earth, an ellipsoid with additional undulations known as the geoid. This explained how to improve the accuracy of geoid heights and vertical deflection, important components of satellite geodesy.

West worked at Dahlgren for 42 years, and retired in 1998.

West’s most prominent work concerned mathematical modeling of Earth’s geoid, or Earth’s precise shape and gravitational characteristics. Since Earth is not actually a sphere, precise navigation through space by satellites is the result of incredibly accurate geodetic models. West’s computations and data analysis produced these models, which would later become foundational toward the development of modern satellite navigation systems. It was her work that contributed directly to the accurate and reliable Global Positioning System (GPS). Without an effective Earth model, GPS satellites would make huge errors and be useless for navigation and mapping. West’s mathematical work enabled GPS systems to achieve the levels of precision that are necessary today.

Personal life and death West met her husband Ira at the Naval Surface Warfare Center Dahlgren Division, where he also worked as a mathematician. They were two of only four black employees at the time. They have three children and seven grandchildren.

The civil rights movement was fully underway during her time at the base. Though she supported the movement, she could not participate in protests because she was a government employee. In Boomtown, where married people lived on base, she was part of a club of black women who discussed civil rights topics.

During her career, West encountered many hardships because of racism against African Americans. A prime example was the lack of recognition she received while working, while her white coworkers received praise and added privileges. Her biography makes clear her disappointment at not being granted projects that included travel and exposure.

West continued to prefer using paper maps over GNSS-based navigation systems, saying: "I'm a doer, hands-on kind of person. If I can see the road and see where it turns and see where it went, I am more sure."

West died in Fredericksburg, Virginia, on January 17, 2026, at the age of 95.

Legacy

West's vital contributions to GPS technology were recognized when a member of her sorority Alpha Kappa Alpha read a short biography West had submitted for an alumni function. Captain Godfrey Weekes, commanding officer at the Naval Surface Warfare Center Dahlgren Division, described the role played by West in the development of Global Positioning System: "She rose through the ranks, worked on the satellite geodesy, and contributed to the accuracy of GPS and the measurement of satellite data. As Gladys West started her career ... in 1956, she likely had no idea that her work would impact the world for decades to come". West was the project manager in the development of Seasat, the first satellite that monitored the oceans. Her research continued with programming an IBM 7030 Stretch Computer used to create a geodetic model of the shape of the Earth. West agreed, saying "When you're working every day, you're not thinking, 'What impact is this going to have on the world?' You're thinking, 'I've got to get this right.

West was selected by the BBC as part of their 100 Women of 2018.

In 2024, Virginia's Fredericksburg City School Board voted to name its third elementary school in her honor, Gladys West Elementary School. West was awarded the Institute of Electrical and Electronics Engineers' President's Award in 2024. Her contributions to the leading science were later valorized in an obituary published in the leading scientific journal Nature.

Publications