Cobb, Jewel Isadora Plummer (1924-...), is an African American biologist known for her research and her work to promote science education. Cobb conducted important studies on skin cells that produce the brown pigment melanin. She was interested in learning how these cells work normally and how they become cancerous. Cobb also studied the effects of newly discovered chemotherapies (drug treatments). Her research focused on the effects that cancer therapies have on normal human cells.