Fritz von Opel
Fritz Adam Hermann von Opel , was the only child of Wilhelm von Opel and a grandson of Adam Opel, founder of the Opel company. He is remembered mostly for his spectacular demonstrations of rocket propulsion that earned him the nickname Rocket Fritz.
Opel was born in Rsselsheim and educated at the technical university of Darmstadt. After graduation, he was made director of testing for the Opel company and also put in charge of publicity. In the 1920s, he became interested in using rockets in publicity stunts for the company and sought advice from Max Valier of the newly formed Verein fr Raumschiffahrt and Friedrich Sander, a pyrotechnics manufacturer from Bremerhaven.
Source: Wikipedia