William W. Hagen (born 1942) is a historian and professor of history at the University of California-Davis.
Hagen's focus is on modern European history, primarily in relation to Germany and Eastern Europe.
From 1992 to 1998, Hagen served as director of the UC Davis Center for History, Society, and Culture.
In 1996, he served as president of the Conference Group for Central European History (American Historical Association).Recipient of grants, including from the Alexander von Humboldt-Stiftung, National Endowment for the Humanities, and the Institute for Advanced Study, Princeton, NJ, where he was fellow in residence 1990-91.
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