Walter M. Elsasser

Walter M. Elsasser, born on March twentieth, nineteen oh four, was a distinguished physicist and biologist who made significant contributions to our understanding of Earth's magnetic field. A German-born American, he is best known for developing the dynamo theory, which explains how electric currents in the fluid outer core generate the planet's magnetic field. His innovative approach revealed that the history of this magnetic field can be traced through the magnetic orientation of minerals found in rocks.

In addition to his groundbreaking work on magnetism, Elsasser proposed an intriguing yet unpublished idea regarding the diffraction of electrons passing through a crystal, suggesting it would demonstrate their wavelike nature. This concept laid the groundwork for the subsequent Davisson–Germer experiment, which ultimately earned a Nobel Prize in Physics.

Elsasser's academic career was marked by his tenure as a Professor of Geophysics at Princeton University from nineteen sixty-two to nineteen sixty-eight. He later served as an adjunct Professor of Geophysics at Johns Hopkins University from nineteen seventy-five until nineteen ninety-one. His legacy is honored at Johns Hopkins, where the Olin Hall features a memorial dedicated to him in its lobby.