Albert Einstein

Albert Einstein; (14 March 1879 – 18 April 1955) was a German-born  theoretical physicist  who developed the  general theory of relativity, effecting a revolution in  physics. For this achievement, Einstein is often regarded as the father of  modern physics and the most influential physicist of the 20th century. While best known 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".  The latter was pivotal in establishing  quantum theory.