19th c.

Elmer Imes and infrared spectroscopy

The second African American to earn a PhD in physics, Imes’ work in infrared spectroscopy pinpointed the distances between atoms in molecules and helped verify quantum theory...

Mary Agnes Chase, feminist and botanist

Sophie Germain, pioneer in elasticity and number theory

Germain’s lifetime of contributions to mathematics ranged from elasticity theory to a new approach to Fermat’s Last Theorem––but as a woman, she had been barred from studying at the École Polytechnique...

Ynes Mexia, plant explorer

Mexia found her calling late in life, but her contributions to botany are impressive...

Carlos Finlay and the Yellow Fever vector

Cuban Doctor Carlos Finlay successfully identified mosquitos as the vector for the transmission of deadly Yellow Fever...

Emmy Noether and a revolution in algebra

Noether was recognized as one of the most important mathematicians of her time, but, as a Jewish woman, the Nazi’s rise to power forced her from her (already precarious) university position in Germany...

Ernest Everett Just and cell biology

A brilliant experimentalist, Just illuminated the complex biology of fertilization and development. As a black man, he faced difficulty obtaining a research appointment at an American university...

Mary Anning and her fossils

As a poor woman, Anning was barred from full participation in science in 19th c. Britain. Nevertheless, her paleontological discoveries––including the first plesiosaur...

Ada Lovelace and the first computer program

Lovelace has been dubbed the "first computer programmer." Defying expectations for women during her era...