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.
Henri Rouvière Henri Rouvière (23 December 1876 – 26 October 1952) was a professor of anatomy born in Le Bleymard, France.