Valerie Thomas

Valerie L. Thomas was born on 8 February 1943 in Baltimore, Maryland, and developed an early fascination with electronics after watching her father repair televisions, though her interest was actively discouraged both at home and by school guidance counsellors, who steered her away from science and mathematics courses despite her evident aptitude, reflecting the broader gender barriers facing girls interested in technical fields during this period.

Thomas pursued physics regardless, earning her degree from Morgan State University in 1964 as one of only two women in her graduating physics class, and joined NASA that same year as a data analyst, beginning a nearly 40-year career with the agency. She quickly moved into more technically significant roles, developing computer programmes to support satellite operations and managing large-scale data systems for early NASA satellite image processing.

Thomas led the development of the digital media formats used for NASA's Landsat programme, the long-running satellite system providing continuous imagery of Earth's surface for environmental and geological monitoring, work of significant lasting scientific value that has supported decades of subsequent Earth observation research built on the data systems she helped establish.

In 1976 Thomas attended a scientific exhibition where she encountered a demonstration using concave mirrors to create the illusion of a three-dimensional lightbulb appearing to float in space, an effect that sparked her interest in the underlying optical physics, and she spent the following years researching and refining the concept, ultimately inventing the 'illusion transmitter,' a device using concave mirrors to produce optical illusions that create the appearance of three-dimensional images.

Thomas received a patent for the illusion transmitter in 1980, and NASA subsequently adapted principles from her invention for practical applications including surgical technology allowing doctors to visualise procedures with enhanced depth perception. The core optical concept underlying her invention has also influenced later research into related three-dimensional imaging and display technologies.

Thomas continued her NASA career until her retirement in 1995, having held several senior technical management positions, including overseeing the computer facility responsible for critical Landsat data processing and later serving on NASA's Space Physics Analysis Network project. Since retirement, she has remained active in mentoring young people, particularly girls and students of colour, pursuing STEM careers, drawing directly on her own experience overcoming discouragement to succeed in a field that had actively tried to steer her away from it.