Herman Potočnik, Croatian-Austrian engineer (b. 1892)
Herman Potočnik (pseudonym Hermann Noordung; 22 December 1892 – 27 August 1929) was an ethnically Slovenian Austro-Hungarian Army officer, electrical engineer and astronautics theorist. He is regarded as a pioneer and visionary of modern space flight and is chiefly remembered for his work addressing the long-term human habitation of space.