"Johann Nathanael Lieberkühn (5 September 1711, Berlin – 7 October 1756, Berlin) was a German physician. His middle name is sometimes misspelled Nathaniel.
Lieberkühn studied theology initially, ...
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and then moved to physics, in particular mechanics. It was only after this that he commenced medicine. In 1739 he moved to Leiden, in the Netherlands, and then a year later to London and Paris. Following this he returned to Berlin as a member of the Collegium medico-chirurgicum, the body charged with improving the teaching and science of medicine in the Holy Roman Empire, making mathematical and optical instruments and working as a professor and medical doctor." - (en.wikipedia.org 05.11.2019)