Edward Calvin Kendall was an American biochemist known for isolating and structurally defining the hormone cortisone, along with his scientific partners Tadeus Reichstein and Philip S. Hench. He was awarded the Nobel Prize in Physiology or Medicine in 1950 for the discovery. Born in 1886, Kendall also worked on the isolation of thyroxine, a hormone produced by the thyroid gland. He died in 1972.