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Albert Einstein was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). His work is also known for its influence on the philosophy of science.

Einstein is best known to the general public for his mass–energy equivalence formula E = mc2, which has been dubbed "the world's most famous equation". He 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", a crucial step in the development of quantum theory.

Einstein is generally considered the most influential physicist of the 20th century and one of the most influential people of the 20th century. His work is also known for its influence on the philosophy of science.