Hermann Oberth was a German physicist and engineer, born on June 25, 1894, in Transylvania, Romania. He is best known for his pioneering work in rocketry and astronautics, significantly influencing the development of space travel. Oberth's book, *Die Rakete zu den Planetenräumen* (The Rocket into Planetary Space), published in 1923, laid the groundwork for future rocket science. Oberth was a key figure in the early days of the German rocket program and later collaborated with Wernher von Braun in the United States. His contributions helped shape modern space exploration, making him one of the founding fathers of astronautics.