Education
He studied medicine at the Universities of Heidelberg, Würzburg and Giessen, earning his doctorate at the latter institution in 1829.
He studied medicine at the Universities of Heidelberg, Würzburg and Giessen, earning his doctorate at the latter institution in 1829.
He was a native of Frankfurt am Main. Afterwards he settled in Frankfurt am Main, where he worked as a general practitioner of medicine while maintaining an active interest in botany. From 1831 Fresenius was curator of the Senckenberg herbarium and a teacher at the Senckenberg Research Institute (Forschungsinstitut Senckenberg).
With his student Anton de Bary (1831–1888), he conducted microscopic investigations of algae and fungi.
He died in Frankfurt on 1 December 1866 at the age of 58. The plant genus Fresenia from the family Asteraceae is named after him.