Hans Geiger

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Johannes (Hans) Wilhelm Geiger (September 30, 1882 - September 24, 1945) was a German physicist. Together with Walter MÃÂÃÂ¼ller he developed the Geiger counter.

In 1902 Geiger began to study physics and mathematics in Erlangen and later attained a doctorate to 1906. In 1907 he began work with Ernest Rutherford in Manchester. In 1912 he became leader of the Physical-Technical Reichsanstalt in Berlin, 1925 professor in Kiel, 1929 in TÃÂÃÂ¼bingen, and from 1936 in Berlin. While in Berlin he developed, together with the graduate student Walter MÃÂÃÂ¼ller, the Geiger counter.

He was one of the discoverers of Geiger-Nuttals law and performed experiments that lead to Rutherford's atomic model.