A. S. (Alta Sharon) Walker

Alta Sharon Walker, also known as A. S. Walker, was an American geologist, geochemist, and science writer. Born on April 28, 1942, in Ogdensburg, New York, she studied at Syracuse University, the University of Minnesota, and Rice University, where her doctoral work focused on lunar samples from the Apollo missions.

Her career included work for the National Air and Space Museum, the U.S. Geological Survey, and the Department of the Interior. She wrote about deserts, geology, and natural resources, and her research and travel also led to published work on desertification in China. Beyond her own books, she contributed to broader science writing projects, including work related to geomorphology and planetary science.

Walker is especially interesting as an author because her books grew out of hands-on scientific experience. She wrote with the perspective of someone who had studied both Earth and space, making her a strong guide for readers curious about landscapes, resources, and how geology shapes the world around us.