Hans von Ohain is the developer of the first turbojet engine used in flight and is a renowned expert in the field of propulsion and energy conversion. Von Ohain received a doctorate in Physics and Allied Mechanics in 1935 at the University of Goetingen, Germany, and was employed by Ernst Heinkel during the 1930s. In 1939 the first turbojet flight took place with the flight of the Heinkel He 178, which had the He S 3B engine. Two years later, von Ohain developed the He S 8A, which was the first jet fighter aircraft. In 1947 von Ohain came to the United States and became a research scientist at Wright-Patterson Air Force Base in Ohio. In 1963 he became chief scientist of the Aerospace Research Laboratory and in 1975, chief scientist of the Aero Propulsion Laboratory. After retiring in 1979, von Ohain served as Professor of Mechanical Engineering at the University of Dayton and as a consultant to both government and industry. Von Ohain has published more than 30 technical papers and has registered 19 United States patents.