In 1997, AGU will award the first Lehmann Medal in recognition of outstanding research on the structure, composition, and dynamics of the Earth's mantle and core. The medal, which will be awarded no more than every other year, is named for Inge Lehmann, the only woman to receive the Union's Bowie Medal. The Lehmann Medal is the first AGU honor to be named for a woman and the first to be named for a scientist who worked outside of the United States. What follows is a biographical sketch of Lehmann.