#9 Max Valier (February 9, 1895 – May 17, 1930)
Max Valier was an Austrian rocketry pioneer. He helped found the German Verein für Raumschiffahrt (VfR – “Spaceflight Society”) that would bring together many of the minds that would later make spaceflight a reality in the 20th century. Valier dadicated his life to creating rocket-powered sleds and trains. His rockets used solid fuels, but he decided he would try to use liquid fuel for his rockets, for the first time. He later died in his laboratory because of an explosion of one of the motors that ran on an alcohol-like substance. His protégéArthur Rudolph went on to develop an improved and safer version of Valier’s engine.