Ernst Stuhlinger
Ernst Stuhlinger was a Germanborn American atomic, electrical, and rocket scientist. After being brought to the United States as part of Operation Paperclip, he developed guidance systems with Wernher von Brauns team for the US Army, and later was a scientist with NASA. He was also instrumental in the development of the ion engine for longendurance space flight, and a wide variety of scientific experiments.
Stuhlinger was born in Niederrimbach , Wrttemberg, Germany. At age 23, he earned his doctorate in physics at the University of Tbingen in 1936, working with Otto Haxel, Hans Bethe and his advisor Hans Geiger. In 1939 to 1941, he worked in Berlin, on cosmic rays and nuclear physics as an assistant professor at the Berlin Institute of Technology developing innovative nuclear detector instrumentation.
Source: Wikipedia