Albert Einstein was a German-born theoretical physicist who developed the general theory of relativity, one of the two pillars of modern physics . While best known for his mass–energy equivalence formula E = mc2, 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". The latter was pivotal in establishing quantum theory.
Einstein published more than 300 scientific papers and more than 150 non-scientific works. His intellectual achievements and originality have made the word "Einstein" synonymous with "genius".