author
b. 1942
A geologist and science writer, she explored some of the driest places on Earth and helped map worlds far beyond it. Her work connects desert geology, remote sensing, and planetary science in a way that still feels adventurous.

by A. S. (Alta Sharon) Walker
Alta Sharon Walker, also published as A. S. Walker, was an American geologist born on April 28, 1942. Reliable catalog records connect her with works on desert geology and remote sensing, while biographical sources identify her as a scientist who worked with the U.S. Geological Survey, the Department of the Interior, and the National Air and Space Museum.
Her career brought together field geology and space-age mapping. She is noted for research on deserts and for work related to planetary mapping, including studies connected with the Moon and the moons of Jupiter. That mix of Earth science and planetary science gives her writing a broad, exploratory feel.
Walker is best known in book catalogs for works such as Deserts: Geology and Resources and for an annotated bibliography on remote sensing methods for monitoring desertification. Public biographical sources indicate that she died on August 1, 2015.