Jean-Pierre [François] Blanchard was a French inventor, best known as a pioneer of gas balloon flight, who distinguished himself in the conquest of the air in a balloon, Notable for his successful hydrogen balloon flight in Paris on 2 March 1784, Blanchard later moved to London and undertook flights with varying propulsion mechanisms. His historic achievement came on 7 January 1785, crossing the English Channel from Dover Castle to Guînes in about 2½ hours, receiving acclaim from Louis XVI and earning a substantial pension.

Les Frères Robert were two French brothers. Anne-Jean Robert (1758–1820) and Nicolas-Louis Robert (1760–1820) were the engineers who built the world's first hydrogen balloon for professor Jacques Charles, which flew from central Paris on 27 August 1783. They went on to build the world's first manned hydrogen balloon, and on 1 December 1783 Nicolas-Louis accompanied Jacques Charles on a 2-hour, 5-minute flight. Their barometer and thermometer made it the first balloon flight to provide meteorological measurements of the atmosphere above the Earth's surface.