Albert Einstein was a Nobel Prize winning scientist who worked on the Manhattan project committee.einstein-tongue.jpg
In 1905, Albert Einstein developed the theory of relativity, which was used to relate mass to energy. His theory showed that even a small amount of fissile material could generate a catastrophic explosion. This was later used to calculate the power from a nuclear device.
After Hitler came to power in Germany, Einstein, a Jew, was able to see the danger in staying in Germany. He quickly left the country for the United States, where he received a warm welcome, having already been made famous.
Einstein was pivotal in starting the Manhattan Project; Leo Szilard believed his authority was great enough to convince Roosevelt to look into a weapons project. Thus, he was the one who drafted the first letter to Roosevelt, dubbed the Einstein letter, which convinced Roosevelt to create the Manhattan project. (Sullivan 16)