Theodor Wilhelm Engelmann

T.W. Engelmann
Born14 November 1843
Died20 May 1909 (1909-05-21) (aged 65)
CitizenshipGerman
Alma materUniversity of Leipzig
Known forDiscoveries concerning the operation of muscles; discoveries concerning photosynthesis
Scientific career
FieldsPhysiology
InstitutionsUniversity of Utrecht, University of Berlin

Theodor Wilhelm Engelmann (14 November 1843 – 20 May 1909) was a German botanist, physiologist, microbiologist, university professor, and musician whose 1882 experiment measured the effects of different colors of light on photosynthetic activity and showed that the conversion of light energy to chemical energy took place in the chloroplast.