Mary Gertrude Keyes (February 24, 1904 – May 8, 1984) was an American musician and research chemist based in Washington, D.C., and later in Riverside, California.
[8][9] Keyes worked in the Petrographic Laboratory the United States Geological Survey as a young woman, preparing thin sections of rock samples for analysis.
[13][14] In addition to her work with Washington, Keyes analyzed samples for Reginald Aldworth Daly's "The Geology of Saint Helena Island" (1927), Bailey Willis's Studies in Comparative Seismology: Earthquake Conditions in Chile (1929) and other reports.
[15][16][17] In the 1940s Keyes was a scientific aide in the Division of Soil Chemistry and Physics in the United States Department of Agriculture.
[29] Her nephew Jared Loewenstein was a librarian at the University of Virginia, known for building the school's collection of Jorge Luis Borges materials.