Albert EINSTEIN, a German-born physicist, is one of the most famous physicists in history. He is best known for his theory of relativity and his mass-energy equivalence formula, E=mc2. Isidor Isaac Rabi was an American physicist who won the Nobel Prize in Physics in 1944 for his discovery of nuclear magnetic resonance. Nikola Tesla was a Serbian-American inventor and engineer who made significant contributions to the development of electricity and radio technology.