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.
Robert Huggins Robert A. Huggins is Professor Emeritus at the Department of Materials Science and Engineering at the School of Engineering at Stanford University and Chief Scientist at the Center for Solar Energy and Hydrogen Research at the University of Ulm.