Julius Bartels

Julius Bartels (August 17, 1899, Magdeburg – March 6, 1964) was a German geophysicist and statistician who made notable contributions to the physics of the Sun and Moon; to geomagnetism and meteorology; and to the physics of the ionosphere. He also made fundamental contributions to statistical methods for geophysics. Bartels was the first President of the International Association of Geomagnetism and Aeronomy. With Sydney Chapman, he wrote the influential book Geomagnetism.

Bartels was awarded his Ph.D. from Göttingen in 1923, then worked at the Potsdam magnetic observatory as a post-doctorate. In 1928 he was named professor at Eberswalde, teaching meteorology. He became full professor at Berlin University in 1936, and director of the Potsdam Geophysical Institute. From 1931 until the second year of World War II he was also a research associate at the Carnegie Institution of Washington. He collaborated with Sydney Chapman to publish the two-volume work Geomagnetism, a definitive reference on geophysics.

...
Wikipedia