Hagen, Hermann August
- Keir B. Sterling
Hagen, Hermann August (30 May 1817–09 November 1893), entomologist and physician, was born in Königsberg, East Prussia (later the Russian enclave of Kaliningrad), the son of Carl Heinrich Hagen, a professor at the Albert University and counselor to the King of Prussia, and Anna Dorothea Linck. As a youth, Hagen was strongly influenced by his grandfather, who had been a professor of natural history at the university. Hagen graduated from the local gymnasium in 1836 and earned an M.D. from the University of Königsberg in 1840. Early on he became interested in dragonflies, and his medical thesis constituted a study of the European species of this insect. His first entomological paper, a study of the dragonflies of East Prussia, appeared in 1839, when he was twenty-two....