Albert Einstein (1879 - 1955) was a German-born, naturalized-American theoretical physicist who is famous for his theories of special and general relativity which related space, time, and motion. He received the Nobel Prize in physics in 1921 for his explanation of the photoelectric effect. In his most productive year in physics, 1905, he published his papers on the photoelectric effect, Brownian motion, and special relativity while discharging his duties as a Swiss Patent examiner in Berne. He is the author of the most famous equation, E=mc2, which relates the quantities of mass and energy. The theories of relativity explain the effects of the postulate that the speed of light appears to be the same when observed from any inertial reference frame, no matter what the speed of the observer. He is considered the last of the three giants of the science of mechanics: Galileo, Newton, and Einstein 


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