By "your" I assume you mean America's. There were a bunch of German rocket scientists repatriated to the US after World War II, but the one you're probably thinking of is Wernher von Braun.
So that scientists could investigate the biological effects of space travel without risking the lives of humans.
Wernher von Braun
Konrad Dannenberg
During World War 2, German scientists used American patents to develop rockets capable of sending bombs to England from Germany. When the Russian army entered Germany, they fled to American. They used their knowledge to build the American space program.
Scientists at NASA do various things. The tasks are all space or physics related. NASA is US's Space Program. They launched satellites like Swift,skylab ect. NASA scientists test zero G, jet propulsion, sample space rocks ect. Space Shuttles and Mars Rovers are one of NASA's achievements.
Albert Einstein Wernher von Braun, rocket scientist and architect of the US space program
The space race was between the Soviet Union (Russia) and the United States. Both the US and the USSR captured German scientists that worked on rockets for World War II.
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Wernher von Braun .
Germany's use of the V2 rocket during WW2 was the inspiration for the Space program. In fact many of the Scientists that worked on the V2 went to work for either Russia or America after the war.
Scientists do research, do test and go into a space vehicle to do experiments. They also go out the space vehicle in space suits.
A program by JFK to get The Americans to space or to the moon!