Born: July 19, 1921, New York, U.S.
Rosalyn Sussman Yalow is an American medical physicist and Nobel Prize winner, who helped to develop the testing technique known as the radioimmunoassay. Yalow was born in New York City in 1921 and obtained a doctorate in physics from the University of Illinois in 1945. She taught at Hunter College from 1945 to 1950 and worked thereafter at the Veterans Administration Hospital in New York City. In the 1950s, with American physician Solomon Aaron Berson, she developed the radioimmunoassay technique for quantitating very small amounts of biological substances in body fluids, using a radioactively labeled material. Yalow shared the 1977 Nobel Prize in physiology or medicine for this work.