Heinrich Henkel was a German composer who studied with Johann Anton André at Offenbach am Main and became a figure of some importance for Mozart research.
Heinrich Hoffmann was a German psychiatrist, who also wrote some short works including Der Struwwelpeter, an illustrated book portraying children misbehaving.
Heinrich Dieter 'Dick' Holland was an emeritus professor in the Earth and Planetary Sciences department of Harvard University. He made major contributions to the understanding of the Earth's geochemistry, especially large-scale geochemical and biogeochemical cycles. He has also contributed to the field of planetary chemistry and planetary evolution.
Heinrich Joseph von Collin (1771–1811), Austrian dramatist, was born in Vienna, on 26 December 1771. He received a legal education and entered the Austrian ministry of finance where he found speedy promotion. In 1805 and in 1809, when Austria was under the heel of Napoleon, Collin was entrusted with important political missions. In 1803 he was, together with other members of his family, ennobled, and in 1809 made Hofrat. He died on 28 July 1811 in Vienna.
Heinrich Khunrath, or Dr. Henricus Khunrath as he was also called, was a German physician, hermetic philosopher, and alchemist. Frances Yates considered him to be a link between the philosophy of John Dee and Rosicrucianism. His name, in the spelling "Henricus Künraht" was used as a pseudonym for the 1670 publisher of the Tractatus Theologico-Politicus of Baruch Spinoza.
