Theodor Wulf (July 28, 1868 - June 19, 1946) was a German physicist and Jesuit priest who was one of the first experimenters to detect excess atmospheric radiation.Theodor Wulf became a Jesuit priest at the age of 20, before studying physics with Walther Nernst at the University of Göttingen. He taught physics at Valkenburg, a Jesuit University from 1904 to 1914 and 1918-1935.