Clerk, Swiss Patent Office, Bern, 1902-1909.
Lecturer, University of Bern, 1908.
Associate professor of physics, University of Zurich, 1909-1910.
Professor of physics, Unversity of Prague, 1911.
Professor of physics, Swiss Federal Polytechnic Institute, 1912-1913.
Director, Kaiser Wilhelm Physical Institution, Berlin, 1914-1933.
Professor of Theoretical Physics, Institute for Advanced Study, Princeton, 1933-1955.