Rosalyn Sussman Yalow

Rosalyn Sussman Yalow (1921-2011) was an American medical physicist and one of the most accomplished scientists of the 20th century. She is best known for developing radioimmunoassay (RIA), a groundbreaking technique that uses radioactive isotopes to measure minute quantities of biological substances in blood and body tissues. This innovation revolutionized medical diagnostics and endocrinology, enabling the measurement of hormones, vitamins, and drugs with unprecedented precision. In 1977, Yalow became the second woman ever to win the Nobel Prize in Physiology or Medicine, a recognition of her exceptional contributions to science. Despite facing significant gender discrimination in academia and the scientific community—she was often the only woman in her laboratory—Yalow persevered with remarkable determination and became a role model for women in STEM fields. Her work not only advanced medical science but also demonstrated the critical importance of gender diversity in scientific research. Yalow remained actively engaged in her field until her death in 2011, continuing to advocate for women scientists and mentoring younger researchers throughout her career.