Paul Dietrich Giseke was a German botanist, physician, teacher and librarian.

Giseke started his studies at the Academic Gymnasium in Hamburg. He joined the University of Göttingen in 1764 and graduated in 1767. He then went on an extended trip through France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 and Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 and met Linnaeus, becoming his student and a lifelong friend - Linnaeus named the genus Gisekia after him.

Back from abroad he settled in Hamburg and started his practice as physician, but in December 1771 started teaching as Professor of Physics and Discourse

Discourse

Discourse generally refers to "written or spoken communication". The following are three more specific definitions:...

at the Academic Gymnasium in Hamburg.