Johann III Bernoulli (also known as Jean; 4 November 1744, Basel – 13 July 1807, Berlin), grandson of Johann Bernoulli, and son of Johann II Bernoulli. He was known around the world as a child prodigy. He studied at Basel and at Neuchâtel, and when thirteen years of age took the degree of doctor in philosophy. When he was fourteen, he got the degree of master of jurisprudence. At nineteen he was appointed astronomer royal of Berlin. A year later, he reorganized the astronomical observatory at the Berlin Academy. Some years after, he visited Germany, France and England, and subsequently Italy, Russia and Poland. His travel accounts were of great cultural and historical importance (1772–1776; 1777–1779; 1781).He wrote about Kashubians.
On his return to Berlin he was appointed director of the mathematical department of the academy. His writings consist of travels and astronomical, geographical and mathematical works. In 1774 he published a French translation of Leonhard Euler’s Elements of Algebra. He contributed several papers to the Academy of Berlin, and in 1774 he was elected a foreign member of the Royal Swedish Academy of Sciences.
He was entrusted with the Bernoulli family's mathematical estate. Also, his correspondence, 2,800 items, were sold to the Steckholm Academy until they were found by Gylden at the Stockholm Observatory in 1877. He is one of the last notable members of the Bernoulli family.