Who was the French professor that the Robert brothers built the world's first hydrogen balloon for?
Jacques Charles Jacques Alexandre César Charles (November 12, 1746 – April 7, 1823) was a French inventor, scientist, mathematician, and balloonist.
Adolphe Regnier Adolphe or Jacques-Auguste-Adolphe Regnier (7 July 1804, Mainz - 20 October 1884, Fontainebleau) was a French philologist. He is most notable as a professor at the collège de France (1804 – 1884) and for his numerous translations of the poems and plays of the German author Friedrich Schiller.