Albert Einstein (14 March 1879 18 April 1955) was a German-born theoretical physicist. He is best known for his theory of relativity and specifically massenergy equivalence, expressed by the equation E = mc2. Einstein received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."
Einstein published over 300 scientific works and over 150 non-scientific works. In 1999 Time magazine named him the "Person of the Century". In wider culture the name "Einstein" has become synonymous with genius, and he has since been regarded as one of the most influential people in human history.