Albert Einstein was a German-born theoretical physicist who developed the theory of relativity, one of the pillars of modern physics. Some of his major accomplishments include developing the special theory of relativity in 1905 which established that the laws of physics are the same in all inertial frames of reference, and that the speed of light in a vacuum is independent of the motion of all observers. He is also known for his mass-energy equivalence formula E=mc2. Einstein received the Nobel Prize in Physics in 1921 and was influential in the development of atomic energy, among other scientific contributions. He later immigrated to the United States due to rising Naziism in Germany.