The Manhattan Project Scientist included three prominent scientists: Urey, Fermi, and BOHR. Urey was an American physical chemist who won the Nobel Prize in Chemistry in 1934 for his discovery of heavy hydrogen. Fermi was an Italian-American physicist who won the Nobel Prize in Physics in 1938 for his work on nuclear reactions. BOHR was a Danish physicist who won the Nobel Prize in Physics in 1922 for his work on atomic structure. All three scientists were involved in the Manhattan Project, which was a top-secret research project during World War II to develop the first atomic bomb.